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Note 5 - Fair Value Measurements - Fair Value Assets by Investment Category (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Assets, Fair Value, Cash and Cash Equivalents	$ 59,446	$ 57,800
Assets, Fair Value, Other Current Assets	1,363	2,177
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value, Cash and Cash Equivalents	0	1
Assets, Fair Value, Other Current Assets	394	586
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value, Cash and Cash Equivalents	864	268
Assets, Fair Value, Other Current Assets	969	1,591
Cash [Member]
Assets, Fair Value, Cash and Cash Equivalents	58,582	57,531
Assets, Fair Value, Other Current Assets	0	0
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value, Cash and Cash Equivalents		1
Assets, Fair Value, Other Current Assets		0
Money Market Funds, Rabbi Trust [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value, Cash and Cash Equivalents	0	0
Assets, Fair Value, Other Current Assets	394	586
Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value, Cash and Cash Equivalents	864	268
Assets, Fair Value, Other Current Assets	969	1,591
Reported Value Measurement [Member]
Assets, fair value	60,810	59,977
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	394	587
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,834	1,859
Reported Value Measurement [Member] \| Cash [Member]
Assets, fair value	58,582	57,531
Reported Value Measurement [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value		1
Reported Value Measurement [Member] \| Money Market Funds, Rabbi Trust [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	394	586
Reported Value Measurement [Member] \| Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,834	1,859
Estimate of Fair Value Measurement [Member]
Assets, fair value	61,017	60,239
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	394	587
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	2,041	2,121
Estimate of Fair Value Measurement [Member] \| Cash [Member]
Assets, fair value	58,582	57,531
Estimate of Fair Value Measurement [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value		1
Estimate of Fair Value Measurement [Member] \| Money Market Funds, Rabbi Trust [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	394	586
Estimate of Fair Value Measurement [Member] \| Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	$ 2,041	$ 2,121

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities:
Net earnings	$ 14,984	$ 18,322
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	6,624	6,684
Stock-based compensation	2,077	1,179
Amortization of deferred financing costs	328	295
Deferred tax benefit	(2,748)	(1,412)
Unrealized losses (gains) on foreign currency revaluation	3,145	(3,663)
Inventory impairment	1,186	0
Other, net	26	(518)
Changes in operating assets and liabilities:
Decrease in accounts receivable	3,817	8,220
Decrease (increase) unbilled receivables	1,021	(601)
Increase in inventories	(13,434)	(2,462)
Increase in other current assets	(546)	(3,266)
Decrease in other assets	1,019	2,925
Increase (decrease) in accounts payable	9,731	(3,374)
Decrease in accrued expenses	(6,598)	(11,058)
Decrease in accrued restructuring costs	(320)	(4,508)
(Decrease) increase in income taxes payable	(350)	4,107
Decrease in other liabilities	(6,134)	(2,723)
Net cash provided by operating activities	13,828	8,147
Cash flows from investing activities:
Purchase of property, plant and equipment	(2,643)	(2,790)
Investment in related party notes receivable	0	(333)
Proceeds from disposal/sale of property, plant and equipment	0	58
Acquisition of business, net of cash acquired	(15,224)	0
Net cash used in investing activities	(17,867)	(3,065)
Cash flows from financing activities:
Dividends paid to common shareholders	(840)	(829)
Repayments under revolving line of credit	(13,000)	(12,500)
Borrowings under revolving line of credit	20,000	5,000
Net cash provided by (used in) financing activities	6,160	(8,329)
Effect of exchange rate changes on cash and cash equivalents	(475)	921
Net increase (decrease) in cash and cash equivalents	1,646	(2,326)
Cash and cash equivalents - beginning of period	57,800	68,253
Cash and cash equivalents - end of period	59,446	65,927
Supplementary information:
Income taxes, net of refunds received	5,692	2,277
Interest payments	2,550	4,207
ROU assets obtained in exchange for lease obligations	$ 106	$ 637

Condensed Consolidated Statements of Shareholders' Equity and Redeemable Noncontrolling Interest (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Common Class A [Member]
Dividends declared (in dollars per share)	$ 0.06	$ 0.06
Common Class B [Member]
Dividends declared (in dollars per share)	$ 0.07	$ 0.07
Foreign currency translation adjustment, tax expense	$ 0	$ 0
Unrealized losses (gain) on interest rate swap cash flow hedge, tax	0	0
Unrealized gain on marketable securities arising during the period, tax	0	0
Change in unfunded SERP liability, tax	$ 3	$ 8

Note 13 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Foreign currency translation adjustment, net of taxes of ($312) at March 31, 2026 and ($312) at December 31, 2025	$ (18,347)	$ (19,490)
Unrealized gains on interest rate swap cash flow hedge, net of taxes of $0 at March 31, 2026 and $0 at December 31, 2025	610	906
Unrealized holding gains on marketable securities, net of taxes of ($7) at March 31, 2026 and ($7) at December 31, 2025	20	21
Unfunded SERP liability, net of taxes of $1,000 at March 31, 2026 and $1,003 at December 31, 2025	1,379	1,389
Accumulated other comprehensive loss	$ (16,338)	$ (17,174)

- Definition

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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+ Details

Note 5 - Fair Value Measurements - Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Total derivative assets	$ 1,898	$ 2,703
Foreign Exchange Forward [Member]
Designated as cash flow hedges	379	294
Not designated as hedging instruments	909	1,504
Designated as a cash flow hedge	379	294
Interest Rate Swap [Member]
Designated as cash flow hedges	610	905
Designated as a cash flow hedge	610	905
Total derivative assets	$ 600	$ 900

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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+ Details

Note 5 - Fair Value Measurements

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Fair Value Disclosures [Text Block]

5.	FAIR VALUE MEASUREMENTS

Fair value is defined as an exit price, representing the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants based upon the best use of the asset or liability at the measurement date. Entities are required to use a fair value hierarchy which maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:

Level 1 – Observable inputs such as quoted market prices in active markets;

Level 2 – Inputs other than quoted prices in active markets that are either directly or indirectly observable; and

Level 3 – Unobservable inputs about which little or no market data exists, therefore requiring an entity to develop its own assumptions.

	March 31, 2026
	Carrying value		Fair value		Cash and cash equivalents		Other Current Assets
Cash	$	58,582	$	58,582	$	58,582	$	-
Level 1:
Money market funds (Rabbi Trust)		394		394		-		394
Subtotal		394		394		-		394
Level 2:
Certificates of deposit and time deposits		1,834		2,041		864		969
Subtotal		1,834		2,041		864		969
Total	$	60,810	$	61,017	$	59,446	$	1,363

	December 31, 2025
	Carrying value		Fair value		Cash and cash equivalents		Other Current Assets
Cash	$	57,531	$	57,531	$	57,531	$	-
Level 1:
Money market funds		1		1		1		-
Money market funds (Rabbi Trust)		586		586		-		586
Subtotal		587		587		1		586
Level 2:
Certificates of deposit and time deposits		1,859		2,121		268		1,591
Subtotal		1,859		2,121		268		1,591
Total	$	59,977	$	60,239	$	57,800	$	2,177

As of March 31, 2026 and December 31, 2025, our available-for-sale securities primarily consisted of investments held in a rabbi trust which are intended to fund the Company’s Supplemental Executive Retirement Plan (“SERP”) obligations. These securities are measured at fair value using quoted prices in active markets for identical assets (Level 1) inputs and amounted to $0.4 million at March 31, 2026 and $0.6 million at December 31, 2025.

Throughout 2026 and 2025, the Company entered into a series of foreign currency forward contracts, the fair values of which were $1.3 million at March 31, 2026 and $1.8 million at December 31, 2025. The estimated fair value of foreign currency forward contracts is based on quotes received from the applicable counterparty, and represents the estimated amount we would receive or pay to settle the contracts, taking into consideration current exchange rates which can be validated through readily observable data from external sources (Level 2).

The Company is a party to two interest rate swap agreements as further described in Note 9, "Derivative Instruments and Hedging Activities". The fair value of the interest rate swap agreements was $0.6 million at March 31, 2026 and $0.9 million at December 31, 2025, which was based on market data, and represents the estimated amount we would receive or pay to settle the agreements, taking into consideration current and projected future interest rates as well as the creditworthiness of the parties, all of which can be validated through readily observable data from external sources (Level 2).

The fair values of our derivative financial instruments and their classifications in our condensed consolidated balance sheets as of March 31, 2026 and December 31, 2025 were as follows:

	Balance Sheet Classification	March 31, 2026		December 31, 2025
Derivative assets:
Foreign currency forward contracts:
Designated as cash flow hedges	Other current assets	$	379	$	294
Not designated as hedging instruments	Other current assets		909		1,504
Interest rate swap agreements:
Designated as a cash flow hedge	Other assets		610		905
Total derivative assets		$	1,898	$	2,703

In connection with the acquisition of Enercon as further described in Note 2, "Acquisition", the sellers are eligible to receive an Earnout Payment based on the achievement of certain financial metrics for each of the fiscal 2025 and 2026 Earnout Periods. As this contingent consideration will be settled in cash by Bel if the related metrics are achieved, this contingent consideration has been classified as a liability on the accompanying balance sheets at March 31, 2026 and December 31, 2025. The earnout liabilities were initially recorded at a fair value of $3.3 million at the acquisition date, with subsequent remeasurements to fair value as of the balance sheet dates calculated using Level 3 unobservable inputs. At March 31, 2026 and December 31, 2025, inputs to the valuation approach for the contingent earnout liabilities include the Company's forecasted Enercon EBITDA (as defined under the terms of the Purchase Agreement) for each of 2025 and 2026, an estimated EBITDA volatility measure of 57.1%, and 52.1%, respectively, an expected term of 2 years and a discount rate on the Earnout Payments of 6.10% and 6.66%, respectively. The fair value of the earnout liabilities as of March 31, 2026 and December 31, 2025 were as follows:

		Level 3
	Balance Sheet Classification	March 31, 2026		December 31, 2025
Contingent Liabilities:
Earnout payment liability - 2025	Other current liabilities	$	-	$	4,916
Earnout payment liability - 2026	Other long-term liabilities		2,328		1,709
		$	2,328	$	6,625

The change in the fair value of the 2025 Earnout Payment noted above from December 31, 2025 to March 31, 2026 relates to the full achievement of the earnout targets in 2025 and resulting payment thereof to the Sellers during the first quarter of 2026. Changes in the fair value of the 2026 Earnout Payment have been recognized through earnings during the three months ended March 31, 2026.

Aside from the earnout liability described above, the Company does not have any financial assets measured at fair value on a recurring basis categorized as Level 3, and there were no transfers in or out of Level 1, Level 2 or Level 3 during the three months ended March 31, 2026 or March 31, 2025. There were no changes to the Company’s valuation techniques used to measure fair values on a recurring or nonrecurring basis during the three months ended March 31, 2026 or March 31, 2025.

During 2025, in connection with the Company's annual impairment test of indefinite-lived intangible assets and determined that no impairment charges were required. There were no financial assets or indefinite-lived intangible assets measured at fair value on a nonrecurring basis as of March 31, 2026 or December 31, 2025.

The Company has other financial instruments, such as cash and cash equivalents, accounts receivable, accounts payable and accrued expenses, which are not measured at fair value on a recurring basis but are recorded at amounts that approximate fair value due to their liquid or short-term nature. The fair value of the Company’s long-term debt is estimated using a discounted cash flow method based on interest rates that are currently available for debt issuances with similar terms and maturities. At March 31, 2026 and December 31, 2025, the estimated fair value of total debt was $204.3 million and $196.5 million, respectively, compared to a carrying amount of $204.5 million and $197.5 million, respectively. The Company did not have any other financial liabilities within the scope of the fair value disclosure requirements as of March 31, 2026.

Nonfinancial assets and liabilities, such as goodwill, indefinite-lived intangible assets and long-lived assets, are accounted for at fair value on a nonrecurring basis. These items are tested for impairment upon the occurrence of a triggering event or in the case of goodwill, on at least an annual basis. Based on the Company's assessment, it was concluded that no triggering events occurred during the three months ended March 31, 2026 or March 31, 2025.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Paragraph 107
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-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 3: http://www.xbrl.org/2003/role/exampleRef
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-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (c)(3)
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (a)
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual [Table]
Material Terms of Trading Arrangement [Text Block]	Rule 10b5-1 Trading Arrangements and Non-Rule 10b5-1 Trading Arrangements During the fiscal quarter ended March 31, 2026, none of our officers or directors, as those terms are defined in Rule 16a-1(f), adopted or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Item 408 of Regulation S-K.
Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Note 5 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]

	March 31, 2026
	Carrying value		Fair value		Cash and cash equivalents		Other Current Assets
Cash	$	58,582	$	58,582	$	58,582	$	-
Level 1:
Money market funds (Rabbi Trust)		394		394		-		394
Subtotal		394		394		-		394
Level 2:
Certificates of deposit and time deposits		1,834		2,041		864		969
Subtotal		1,834		2,041		864		969
Total	$	60,810	$	61,017	$	59,446	$	1,363

	December 31, 2025
	Carrying value		Fair value		Cash and cash equivalents		Other Current Assets
Cash	$	57,531	$	57,531	$	57,531	$	-
Level 1:
Money market funds		1		1		1		-
Money market funds (Rabbi Trust)		586		586		-		586
Subtotal		587		587		1		586
Level 2:
Certificates of deposit and time deposits		1,859		2,121		268		1,591
Subtotal		1,859		2,121		268		1,591
Total	$	59,977	$	60,239	$	57,800	$	2,177

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

	Balance Sheet Classification	March 31, 2026		December 31, 2025
Derivative assets:
Foreign currency forward contracts:
Designated as cash flow hedges	Other current assets	$	379	$	294
Not designated as hedging instruments	Other current assets		909		1,504
Interest rate swap agreements:
Designated as a cash flow hedge	Other assets		610		905
Total derivative assets		$	1,898	$	2,703

Business Combination, Contingent Consideration [Table Text Block]

		Level 3
	Balance Sheet Classification	March 31, 2026		December 31, 2025
Contingent Liabilities:
Earnout payment liability - 2025	Other current liabilities	$	-	$	4,916
Earnout payment liability - 2026	Other long-term liabilities		2,328		1,709
		$	2,328	$	6,625

Note 3 - Revenue - Disaggregation of Revenue by Product Group and Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net sales	$ 178,491	$ 152,238
Sales Channel, Directly to Consumer [Member]
Net sales	131,074	109,440
Sales Channel, Through Intermediary [Member]
Net sales	47,417	42,798
North America [Member]
Net sales	114,352	96,271
EMEA [Member]
Net sales	48,573
Europe [Member]
Net sales		40,817
Asia [Member]
Net sales	15,566	15,150
Aerospace, Defense, and Rugged Solutions Segment [Member]
Net sales	99,821	83,122
Aerospace, Defense, and Rugged Solutions Segment [Member] \| Sales Channel, Directly to Consumer [Member]
Net sales	76,087	63,818
Aerospace, Defense, and Rugged Solutions Segment [Member] \| Sales Channel, Through Intermediary [Member]
Net sales	23,734	19,304
Aerospace, Defense, and Rugged Solutions Segment [Member] \| North America [Member]
Net sales	64,178	55,060
Aerospace, Defense, and Rugged Solutions Segment [Member] \| EMEA [Member]
Net sales	33,080
Aerospace, Defense, and Rugged Solutions Segment [Member] \| Europe [Member]
Net sales		25,108
Aerospace, Defense, and Rugged Solutions Segment [Member] \| Asia [Member]
Net sales	2,563	2,954
Industrial Technology and Data Solutions Segment [Member]
Net sales	78,670	69,116
Industrial Technology and Data Solutions Segment [Member] \| Sales Channel, Directly to Consumer [Member]
Net sales	54,987	45,622
Industrial Technology and Data Solutions Segment [Member] \| Sales Channel, Through Intermediary [Member]
Net sales	23,683	23,494
Industrial Technology and Data Solutions Segment [Member] \| North America [Member]
Net sales	50,174	41,211
Industrial Technology and Data Solutions Segment [Member] \| EMEA [Member]
Net sales	15,493
Industrial Technology and Data Solutions Segment [Member] \| Europe [Member]
Net sales		15,709
Industrial Technology and Data Solutions Segment [Member] \| Asia [Member]
Net sales	$ 13,003	$ 12,196

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

+ Details

Note 12 - Retirement, Savings and Deferred Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended
	March 31,
	2026			2025
Service cost	$	80		$	71
Interest cost		241			240
Net amortization		(11	)		(35	)
Net periodic benefit cost	$	310		$	276

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

	March 31,			December 31,
	2026			2025
Prior service cost	$	46		$	55
Net loss		(3,065	)		(3,085	)
	$	(3,019	)	$	(3,030	)

Note 2 - Acquisition - Pro Forma Information (Details) - dataMate [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue, net	$ 180,817	$ 156,224
Net earnings	15,426	18,694
Less: Net earnings attributable to non-controlling interest	3,605	448
Net earnings attributable to Bel Fuse shareholders	$ 11,821	$ 18,246
Common Class A [Member]
Earnings per Class A common share - basic and diluted (in dollars per share)	$ 0.89	$ 1.39
Earnings per Class A common share - basic (in dollars per share)	0.94	1.46
Common Class B [Member]
Earnings per Class A common share - basic and diluted (in dollars per share)	$ 0.94	$ 1.46

Note 15 - Segments (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block]

	Three Months Ended March 31, 2026
	Aerospace, Defense & Rugged Solutions			Industrial Technology & Data Solutions			Total

Net sales	$	99,821		$	78,670		$	178,491
Cost of sales		58,443			49,903			108,346
Segment gross profit		41,378			28,767			70,145
Segment gross profit %		41.5	%		36.6	%		39.3	%
Corporate and other								(547	)
Total consolidated gross profit								69,598
Gross profit %								39.0	%
Research and development costs								8,507
Selling, general and administrative expenses								36,730
Restructuring charges								76
Earnout liability adjustment								619
Interest expense								2,530
Interest income								(150	)
Other income, net								3,494
Earnings before provision for income taxes							$	17,792

	Three Months Ended March 31, 2025
	Aerospace, Defense & Rugged Solutions			Industrial Technology & Data Solutions			Total

Net sales	$	83,122		$	69,116		$	152,238
Cost of sales		49,794			43,336			93,130
Segment gross profit		33,328			25,780			59,108
Segment gross profit %		40.1	%		37.3	%		38.8	%
Corporate and other								(289	)
Total consolidated gross profit								58,819
Gross profit %								38.6	%
Research and development costs								7,222
Selling, general and administrative expenses								29,507
Restructuring charges								(2,933	)
Interest expense								4,152
Interest income								(275	)
Other income, net								(2,639	)
Earnings before provision for income taxes							$	23,785

Segment Reporting [Table Text Block]

	Three Months Ended March 31, 2026
	Aerospace, Defense & Rugged Solutions		Industrial Technology & Data Solutions		Reportable segment total		Corporate and other		Consolidated

Total Assets	$	665,868	$	224,379	$	890,247	$	61,673	$	951,920
Capital Expenditures		2,012		576		2,588		55		2,643
Depreciation and Amortization Expense		4,830		1,642		6,472		152		6,624
Interest Expense		-		15		15		2,515		2,530

	Three Months Ended March 31, 2025
	Aerospace, Defense & Rugged Solutions		Industrial Technology & Data Solutions		Reportable Segment Total		Corporate and other			Total Consolidated

Total Assets	$	647,325	$	230,257	$	877,582	$	(293,165	)	$	584,417
Capital Expenditures		1,173		1,612		2,785		5			2,790
Depreciation and Amortization Expense		5,010		1,535		6,545		139			6,684
Interest Expense		14		101		115		4,037			4,152

- Definition

Tabular disclosure of segment reporting. Includes, but is not limited to, reconciliation of reportable segment amount to corresponding consolidated total.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-15

+ Details

Note 13 - Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	March 31,			December 31,
	2026			2025

Foreign currency translation adjustment, net of taxes of ($312) at March 31, 2026 and ($312) at December 31, 2025	$	(18,347	)	$	(19,490	)
Unrealized gains on interest rate swap cash flow hedge, net of taxes of $0 at March 31, 2026 and $0 at December 31, 2025		610			906
Unrealized holding gains on marketable securities, net of taxes of ($7) at March 31, 2026 and ($7) at December 31, 2025		20			21
Unfunded SERP liability, net of taxes of $1,000 at March 31, 2026 and $1,003 at December 31, 2025		1,379			1,389

Accumulated other comprehensive loss	$	(16,338	)	$	(17,174	)

Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component [Table Text Block]

							Unrealized
	Foreign			Unrealized Gains			Holding
	Currency			on Interest Rate			Gains on
	Translation			Swap Cash			Marketable			Unfunded
	Adjustment			Flow Hedge			Securities			SERP Liability				Total

Balance at December 31, 2025	$	(19,490	)	$	906		$	21		$	1,389			$	(17,174	)
Other comprehensive (loss) income before reclassifications		1,282			68			(1	)		(6	)			1,343
Amount reclassified from accumulated other comprehensive loss		(139	)		(364	)		-			(4	)	(a)		(507	)
Net current period other comprehensive (loss) income		1,143			(296	)		(1	)		(10	)			836

Balance at March 31, 2026	$	(18,347	)	$	610		$	20		$	1,379			$	(16,338	)

Note 1 - Description of Business and Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Basis of Presentation and Significant Accounting Policies [Text Block]

1.	BASIS OF PRESENTATION AND ACCOUNTING POLICIES

The condensed consolidated balance sheets and statements of operations, comprehensive income, shareholders’ equity and redeemable noncontrolling interest, and cash flows for the periods presented herein have been prepared by the Company and are unaudited. In the opinion of management, all adjustments (consisting solely of normal recurring adjustments) necessary to present fairly the consolidated financial position, results of operations and cash flows for all periods presented have been made. The results for the three months ended March 31, 2026 are not necessarily indicative of the results to be expected for the full year. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and footnotes thereto included in the Bel Fuse Annual Report on Form 10-K for the fiscal year ended December 31, 2025.

Certain information and footnote disclosures required under accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted from these condensed consolidated financial statements pursuant to the rules and regulations, including the interim reporting requirements, of the U.S. Securities and Exchange Commission (“SEC”). The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts and the disclosure of contingent amounts in our condensed consolidated financial statements and accompanying notes. Actual results could differ from these estimates.

All amounts included in the tables to these notes to condensed consolidated financial statements, except per share amounts, are in thousands.

The Company’s significant accounting policies are summarized in Note 1 to the consolidated financial statements of the Company included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025. There were no significant changes to these accounting policies during the three months ended March 31, 2026.

Recently Adopted Accounting Standards

In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which focuses on the rate reconciliation and income taxes paid. ASU 2023-09 requires a public business entity ("PBE") to disclose, on an annual basis, a tabular rate reconciliation using both percentages and currency amounts, broken out into specified categories with certain reconciling items further broken out by nature and jurisdiction to the extent those items exceed a specified threshold. In addition, all entities are required to disclose income taxes paid, net of refunds received disaggregated by federal, state/local, and foreign and by jurisdiction if the amount is at least 5% of total income tax payments, net of refunds received. The Company adopted this ASU in 2025. Refer to Note 11, "Income Taxes", for the inclusion of new disclosures required.

Accounting Standards Issued But Not Yet Adopted

In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, which is intended to improve disclosures about a PBE's expenses and address requests from investors for more detailed information about the types of expenses in commonly presented expense captions. Such information should allow investors to better understand an entity's performance, assess future cash flows, and compare performance over time and with other entities. The amendments will require PBEs to disclose in the notes to the financial statements, at each interim and annual reporting period, specific information about certain costs and expenses, including purchases of inventory, employee compensation, depreciation, and intangible asset amortization included in each expense caption presented on the face of the income statement, and the total amount of an entity's selling expenses. The amendments are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027, and may be applied either prospectively or retrospectively. Early adoption is permitted. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements.

Note 7 - Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Property, Plant, and Equipment [Table Text Block]

	March 31,			December 31,
	2026			2025
Land	$	127		$	130
Buildings and improvements		16,383			16,408
Machinery and equipment		106,282			103,445
Construction in progress		7,846			7,114
		130,638			127,097
Accumulated depreciation		(82,159	)		(78,669	)
Property, plant and equipment, net	$	48,479		$	48,428

Note 3 - Revenue 1 (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Increase (Decrease) in Contract with Customer, Liability	$ (1.2)
Contract with Customer, Liability	8.5	$ 9.8
Contract With Customer, Liability, Advance Payments Received	22.1
Contract with Customer, Liability, Revenue Recognized During Period	23.3
Revenue, Remaining Performance Obligation, Amount	$ 22.4

Note 5 - Fair Value Measurements (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)	Mar. 31, 2026 USD ($)	Nov. 14, 2024 USD ($)
Derivative Asset	$ 2,703	$ 1,898
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)	0
Long-Term Debt, Fair Value	196,500	204,300
Long-Term Debt, Gross	197,500	204,500
Fair Value, Nonrecurring [Member]
Assets, Fair Value Disclosure, Total	0	0
Enercon Technologies, Ltd [Member] \| Earnout Payment [Member]
Business Combination, Contingent Consideration, Liability			$ 3,300
Enercon Technologies, Ltd [Member] \| Earnout Payment [Member] \| Fair Value, Inputs, Level 3 [Member]
Business Combination, Contingent Consideration, Liability	$ 6,625	$ 2,328
Enercon Technologies, Ltd [Member] \| Earnout Payment [Member] \| Fair Value, Inputs, Level 3 [Member] \| Measurement Input, Price Volatility [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.521	0.571
Enercon Technologies, Ltd [Member] \| Earnout Payment [Member] \| Fair Value, Inputs, Level 3 [Member] \| Measurement Input, Expected Term [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input		2
Enercon Technologies, Ltd [Member] \| Earnout Payment [Member] \| Fair Value, Inputs, Level 3 [Member] \| Measurement Input, Discount Rate [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.0666	0.061
Foreign Exchange Forward [Member]
Derivative Assets (Liabilities), at Fair Value, Net	$ 1,800	$ 1,300
Interest Rate Swap [Member]
Derivative Asset	900	600
Investments Held in Rabbi Trust [Member]
Debt Securities, Available-for-Sale	$ 600	$ 400

Note 4 - Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended
	March 31,
	2026		2025

Numerator:
Net earnings	$	11,379	$	17,874
Less dividends declared:
Class A		127		127
Class B		736		737
Undistributed earnings	$	10,516	$	17,010

Undistributed earnings allocation:
Class A undistributed earnings	$	1,686	$	2,748
Class B undistributed earnings		8,830		14,262
Total undistributed earnings	$	10,516	$	17,010

Net earnings allocation:
Class A net earnings	$	1,813	$	2,875
Class B net earnings		9,566		14,999
Net earnings	$	11,379	$	17,874

Denominator:
Weighted-average shares outstanding:
Class A - Basic and Diluted		2,115		2,115
Class B - Basic		10,551		10,457
Class B - Diluted		10,554		10,457

Net earnings per share:
Class A - Basic and Diluted	$	0.86	$	1.36
Class B - Basic	$	0.91	$	1.43
Class B - Diluted	$	0.91	$	1.43

Note 12 - Retirement, Savings, and Deferred Compensation Plans - Recognized in Accumulated Other Comprehensive Loss (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Prior service cost	$ 46	$ 55
Net loss	(3,065)	(3,085)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	$ (3,019)	$ (3,030)

Note 14 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	12 Months Ended	252 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2022	Dec. 31, 1994
Arezzo Revenue Agency [Member]
Loss Contingency, Estimate of Possible Loss			$ 12.0
EOS Claim From Principal Commissioner of Customs [Member] \| EOS Power Panama Inc. [Member]
Customs Duties and Imposed Fines	$ 0.9			$ 1.4
Payment for Customs Duties and Imposed Fines and Penalties		$ 0.5
Indemnification Period (Year)	7 years

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.Z.5.Q2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480781/205-20-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section S45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480868/205-20-S45-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-9

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147483359/720-20-50-1

Reference 5: http://www.xbrl.org/2003/role/exampleRef
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-Name Accounting Standards Codification
-Section 55
-Paragraph 27
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482395/460-10-55-27

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Subparagraph (b)
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-3

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-2

+ Details

Note 15 - Segments

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Segment Reporting [Text Block]

15.

SEGMENTS

During the first quarter of 2026, the Company implemented a change in its internal organizational and reporting structure to better align management reporting with customer end markets. As a result, effective March 31, 2026, the Company updated the reportable segment view used by the Company’s Chief Operating Decision Maker (“CODM”) to assess performance and allocate resources. The CODM has not changed.

Following this change, the Company has two reportable segments: (i) Aerospace, Defense & Rugged Solutions and (ii) Industrial Technology & Data Solutions. Prior‑period segment information has been recast to conform to the current period presentation. Accordingly, prior-year segment amounts have been recast for comparability to conform to the current period presentation. The Aerospace, Defense & Rugged Solutions segment primarily includes the Company’s legacy Connectivity Solutions business and Enercon operations. The Industrial Technology & Data Solutions segment primarily includes the Company’s legacy Power Solutions and Protection and Magnetic Solutions operations. These segment descriptions reflect how results are reviewed by the CODM.

There are no intercompany sales between segments.

On a quarterly basis, the Company’s CODM evaluates segment performance using gross profit (a U.S. GAAP measure), which the Company has determined to be its measure of segment profit or loss under ASC 280, as amended by ASU 2023-07. The CODM uses segment gross profit to make commercial and operational decisions and to evaluate capital deployment opportunities. The CODM’s quarterly reporting package also includes segment revenues and cost of sales to arrive at gross profit; cost of sales is a significant segment expense and is therefore included in the segment financial data tables below.

	Three Months Ended March 31, 2026
	Aerospace, Defense & Rugged Solutions			Industrial Technology & Data Solutions			Total

Net sales	$	99,821		$	78,670		$	178,491
Cost of sales		58,443			49,903			108,346
Segment gross profit		41,378			28,767			70,145
Segment gross profit %		41.5	%		36.6	%		39.3	%
Corporate and other								(547	)
Total consolidated gross profit								69,598
Gross profit %								39.0	%
Research and development costs								8,507
Selling, general and administrative expenses								36,730
Restructuring charges								76
Earnout liability adjustment								619
Interest expense								2,530
Interest income								(150	)
Other income, net								3,494
Earnings before provision for income taxes							$	17,792

	Three Months Ended March 31, 2026
	Aerospace, Defense & Rugged Solutions		Industrial Technology & Data Solutions		Reportable segment total		Corporate and other		Consolidated

Total Assets	$	665,868	$	224,379	$	890,247	$	61,673	$	951,920
Capital Expenditures		2,012		576		2,588		55		2,643
Depreciation and Amortization Expense		4,830		1,642		6,472		152		6,624
Interest Expense		-		15		15		2,515		2,530

	Three Months Ended March 31, 2025
	Aerospace, Defense & Rugged Solutions			Industrial Technology & Data Solutions			Total

Net sales	$	83,122		$	69,116		$	152,238
Cost of sales		49,794			43,336			93,130
Segment gross profit		33,328			25,780			59,108
Segment gross profit %		40.1	%		37.3	%		38.8	%
Corporate and other								(289	)
Total consolidated gross profit								58,819
Gross profit %								38.6	%
Research and development costs								7,222
Selling, general and administrative expenses								29,507
Restructuring charges								(2,933	)
Interest expense								4,152
Interest income								(275	)
Other income, net								(2,639	)
Earnings before provision for income taxes							$	23,785

	Three Months Ended March 31, 2025
	Aerospace, Defense & Rugged Solutions		Industrial Technology & Data Solutions		Reportable Segment Total		Corporate and other			Total Consolidated

Total Assets	$	647,325	$	230,257	$	877,582	$	(293,165	)	$	584,417
Capital Expenditures		1,173		1,612		2,785		5			2,790
Depreciation and Amortization Expense		5,010		1,535		6,545		139			6,684
Interest Expense		14		101		115		4,037			4,152

- Definition

The entire disclosure for segment reporting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-40

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 34
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-34

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/exampleRef
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+ Details

Note 2 - Acquisition - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Goodwill	$ 224,812	$ 214,821
dataMate [Member]
Accounts receivable	2,704
Inventories	2,540
Other current assets	205
Total identifiable assets	5,449
Net Fixed Assets	609
Goodwill	10,464
Net assets acquired	16,522
Working Capital Liabilities	1,298
Total consideration paid	$ 15,224

Note 13 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Foreign currency translation adjustment, tax	$ (312)	$ (312)
Unrealized gains of interest rate swap cash flow hedge, tax	0	0
Unrealized holding gains on available-for-sale securities, tax	(7)	(7)
Change in unfunded SERP liability, tax	$ 1,000	$ 1,003

Note 6 - Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Raw materials	$ 81,862	$ 73,629
Work in progress	59,886	58,076
Finished goods	39,486	35,565
Inventories	$ 181,234	$ 167,270

Note 8 - Accrued Expenses

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

8.	ACCRUED EXPENSES

Accrued expenses consist of the following:

	March 31,		December 31,
	2026		2025
Salaries, bonuses and related benefits	$	27,810	$	37,426
Accrued restructuring costs		439		759
Sales commissions		2,848		2,375
Warranty accrual		1,167		1,245
Other		10,463		7,905
	$	42,727	$	49,710

The change in warranty accrual during the three months ended March 31, 2026 primarily related to repair costs incurred and adjustments to pre-existing warranties. The new warranty charges incurred during the three months ended March 31, 2026. were less than $0.1 million.

Restructuring Activities:

Activity and liability balances related to restructuring costs for the three months ended March 31, 2026 are as follows:

			Three Months Ended
			March 31, 2026
	Liability at				Cash Payments			Liability at
	December 31,		New		and Other			March 31,
	2025		Charges		Settlements			2026
Severance costs	$	85	$	76	$	(45	)	$	116
Other restructuring costs		674		-		(351	)		323
Total	$	759	$	76	$	(396	)	$	439

The balance of accrued restructuring costs at March 31, 2026 is primarily related to remaining liabilities associated with the Company's facility consolidation project in China where multiple Industrial Technology & Data Solutions manufacturing sites were consolidated.

Note 3 - Revenue - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Contract assets - current (unbilled receivables)	$ 9,383	$ 9,747
Contract liabilities - current (deferred revenue)	8,540	9,767
Accounts receivable, net	$ 120,036	$ 121,490

Note 11 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Unrecognized Tax Benefits	$ 17.8		$ 17.5
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	2.0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0.1	$ 0.1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 1.2		$ 1.1
Income Tax Jurisdiction, Domestic Federal [Member]
Open Tax Year	2022 2023 2024 2025 2026
Income Tax Jurisdiction, Domestic State and Local [Member]
Open Tax Year	2019 2020 2021 2022 2023 2024 2025 2026

Note 8 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Salaries, bonuses and related benefits	$ 27,810	$ 37,426
Accrued restructuring costs	439	759
Sales commissions	2,848	2,375
Warranty accrual	1,167	1,245
Other	10,463	7,905
Accrued Liabilities, Current	$ 42,727	$ 49,710

Note 9 - Derivative Instruments and Hedging Activities - (Losses) Gains Recognized on Derivatives Instruments Not Designated as Hedging (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivative instruments gain (loss)	$ 893	$ (285)
Foreign Exchange Forward [Member]
Derivative instruments gain (loss)	$ 893	$ (285)

Note 7 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Property, plant and equipment, gross	$ 130,638	$ 127,097
Accumulated depreciation	(82,159)	(78,669)
Property, plant and equipment, net	48,479	48,428
Land [Member]
Property, plant and equipment, gross	127	130
Building and Building Improvements [Member]
Property, plant and equipment, gross	16,383	16,408
Machinery and Equipment [Member]
Property, plant and equipment, gross	106,282	103,445
Construction in Progress [Member]
Property, plant and equipment, gross	$ 7,846	$ 7,114

- Definition

Amount of accumulated depreciation, depletion, and amortization of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection.

+ References + Details

- Definition

Amount, after accumulated depreciation, depletion, and amortization, of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection.

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+ Details

Note 7 - Property, Plant and Equipment

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Property, Plant, and Equipment [Text Block]

7.	PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consist of the following:

	March 31,			December 31,
	2026			2025
Land	$	127		$	130
Buildings and improvements		16,383			16,408
Machinery and equipment		106,282			103,445
Construction in progress		7,846			7,114
		130,638			127,097
Accumulated depreciation		(82,159	)		(78,669	)
Property, plant and equipment, net	$	48,479		$	48,428

Depreciation expense was $2.9 million and $3.0 million, respectively, for the three months ended March 31, 2026 and 2025. Depreciation expense related to our manufacturing facilities and equipment is included in cost of sales and depreciation expense associated with administrative facilities and office equipment is included in selling, general and administrative expense within the accompanying condensed consolidated statements of operations.

- Definition

The entire disclosure for property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection.

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+ Details

Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2026	Apr. 30, 2026
Document Information [Line Items]
Entity Central Index Key	0000729580
Entity Registrant Name	BEL FUSE INC /NJ
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2026
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity File Number	000-11676
Entity Incorporation, State or Country Code	NJ
Entity Tax Identification Number	22-1463699
Entity Address, Address Line One	300 Executive Drive, Suite 300
Entity Address, City or Town	West Orange
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07052
City Area Code	201
Local Phone Number	432-0463
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Common Class B [Member]
Document Information [Line Items]
Title of 12(b) Security	Class B Common Stock ($0.10 par value)
Trading Symbol	BELFB
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		10,607,444
Common Class A [Member]
Document Information [Line Items]
Title of 12(b) Security	Class A Common Stock ($0.10 par value)
Trading Symbol	BELFA
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		2,115,263

Note 5 - Fair Value Measurements - Fair Value of Earnout Liabilities (Details) - Earnout Payment [Member] - Enercon Technologies, Ltd [Member] - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Nov. 14, 2024
Business Combination, Contingent Consideration, Liability			$ 3,300
Fair Value, Inputs, Level 3 [Member]
Earnout payment liability - 2025	$ 0	$ 4,916
Earnout payment liability - 2026	2,328	1,709
Business Combination, Contingent Consideration, Liability	$ 2,328	$ 6,625

Note 10 - Debt

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Debt Disclosure [Text Block]

10.

DEBT

The Company has a Credit and Security Agreement with KeyBank National Association (as amended, the "Credit Agreement" or the "CSA") with a maximum revolving amount of $400 million.

At March 31, 2026 and December 31, 2025, outstanding borrowings under the revolver amounted to $204.5 million and $197.5 million, respectively. The unused credit available under the credit facility was $195.5 million at March 31, 2026 and $202.5 million at December 31, 2025. The Company incurred $2.5 million and $4.2 million of interest expense during the three months ended March 31, 2026 and 2025, respectively, in connection with interest due on its outstanding borrowings under the CSA during each period, including the effects of the 2021 Swaps discussed in Note 9, "Derivative Instruments and Hedging Activities", and amortization of deferred financing costs.

The Company’s borrowings consist of (i) a $60.0 million fixed-rate tranche that bears interest at a stated rate of 2.59% at March 31, 2026 and December 31, 2025, respectively and (ii) a variable-rate tranche of $144.5 million and $137.5 million at March 31, 2026 and December 31, 2025, respectively, that bears interest at SOFR plus the applicable credit spread in accordance with the credit agreement. For comparability, the Company also presents the weighted-average effective interest rates on its borrowings after giving effect to the 2021 interest rate swaps: the weighted-average effective rate on the variable-rate tranche was 3.54% and 3.63% as of March 31, 2026 and December 31, 2025, respectively, and the weighted-average effective rate on total borrowings (fixed and variable) was 4.30% and 4.42%, respectively. The stated variable rates in effect on the measurement dates (before the impact of the swaps) were 5.01% at March 31, 2026 and 5.21% at December 31, 2025.

The CSA contains customary representations and warranties, covenants and events of default. In addition, the CSA contains financial covenants that measure (i) the ratio of the Company’s total funded indebtedness, on a consolidated basis, less the aggregate amount of all unencumbered cash and cash equivalents, to the amount of the Company’s consolidated EBITDA (or the “Leverage Ratio”), in each case as defined and calculated in accordance with the CSA, and (ii) the ratio of the amount of the Company’s consolidated EBITDA to the Company’s consolidated fixed charges (or the “Fixed Charge Coverage Ratio”), in each case as defined and calculated in accordance with the CSA. If an event of default occurs, the lenders under the CSA would be entitled to take various actions, including the acceleration of amounts due thereunder and all actions permitted to be taken by a secured creditor.

At March 31, 2026, the Company was in compliance with its debt covenants, including its most restrictive covenant, the Fixed Charge Coverage Ratio.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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+ Details

Note 7 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Depreciation	$ 2.9	$ 3.0

Note 14 - Commitments and Contingencies

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

14.

COMMITMENTS AND CONTINGENCIES

Legal Proceedings

The Company is party to a number of legal actions and claims, none of which individually or in the aggregate, in the opinion of management, are expected to have a material adverse effect on the Company's consolidated results of operations or consolidated financial position.

On June 23, 2021, a patent infringement lawsuit styled Bel Power Solutions, Inc. v. Monolithic Power Systems, Inc., Case Number 6:21cv00655, was filed in the United States District Court for the Western District of Texas (Waco Division) by Bel Power Solutions, Inc. against Monolithic Power Systems, Inc. ("MPS") for infringement of various patents directed towards systems, methods and articles of manufacture that provide a substantial improvement in power control for circuits, including novel and unique point-of-load regulators. On July 27, 2023, the Western District of Texas court filed an Order granting MPS’s motion for summary judgment of non-infringement. In the first quarter of 2026, the Company entered into a settlement agreement related to the matter described above and expects to make an immaterial cash payment in the second quarter of 2026.

In connection with the Company's 2014 acquisition of the Power-One Power Solutions business ("Power Solutions") of ABB Ltd ("ABB"), there is an ongoing claim by the Arezzo Revenue Agency in Italy concerning certain tax matters related to what was then Power-One Asia Pacific Electronics Shenzhen Co. Ltd. (now Bel Power Solutions Asia Pacific Electronics Shenzhen Co. Ltd, or “BPS China”) for the years 2004 to 2006. In September 2012, the Tax Court of Arezzo ruled in favor of BPS China and cancelled the claim. In February 2013, the Arezzo Revenue Agency filed an appeal of the Tax Court’s ruling. The hearing of the appeal was held on October 2, 2014. On October 13, 2014, BPS China was informed of the Regional Tax Commission of Florence ruling which was in favor of the Arezzo Revenue Agency and against BPS China. An appeal was filed on July 18, 2015 before the Regional Tax Commission of Florence and rejected. On December 5, 2016, the Arezzo Revenue Agency filed an appeal with the Supreme Court and BPS China filed a counter-appeal on January 4, 2017. The Supreme Court rendered a judgment against BPS China in March 2024. BPS China filed an appeal in July 2024. The estimated liability related to this matter is approximately $12.0 million and has been included as a liability for uncertain tax positions on the accompanying condensed consolidated balance sheets at March 31, 2026 and December 31, 2025. As Bel is entitled to be fully indemnified in this matter per the terms of the stock purchase agreement with ABB, a corresponding other asset for indemnification is also included in other assets on the accompanying condensed consolidated balance sheets at March 31, 2026 and December 31, 2025.

In connection with the Company's 2021 acquisition of EOS Power ("EOS"), there is an ongoing claim asserted with respect to EOS by the Principal Commissioner of Customs (Preventive), Mumbai related to customs duties and imposed fines and penalties dating back to 1994. The original demand was in the amount of approximately $1.4 million, of which EOS has paid $0.5 million. EOS filed an Appeal in 2016 which is pending with the Customs, Excise and Service Tax Appellate Tribunal in Mumbai related to the $0.9 million balance of the original demand net of EOS' payment. As part of the EOS acquisition agreement entered into in March 2021, the Company is entitled to be indemnified for this matter for a period of 7 years from the acquisition date. The Company is unable to estimate at this time what amount, if any, may ultimately be due in connection with this claim. As such, no estimate was accrued as of March 31, 2026.

Note 3 - Revenue 2 (Details Textual) $ in Millions	Mar. 31, 2026 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 22.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Amount	$ 4.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Amount	$ 0.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Amount	$ 17.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year

Note 4 - Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net earnings attributable to Bel shareholders	$ 11,379	$ 17,874
Undistributed earnings	10,516	17,010
Net earnings available to common shareholders	11,379	17,874
Common Class A [Member]
Net earnings attributable to Bel shareholders	1,813	2,875
Less dividends declared	127	127
Undistributed earnings	1,686	2,748
Net earnings available to common shareholders	$ 1,813	$ 2,875
Class A common share - basic and diluted (in shares)	2,115	2,115
Net earnings per share, basic (in dollars per share)	$ 0.86	$ 1.36
Common Class B [Member]
Net earnings attributable to Bel shareholders	$ 9,566	$ 14,999
Less dividends declared	736	737
Undistributed earnings	8,830	14,262
Net earnings available to common shareholders	$ 9,566	$ 14,999
Class A common share - basic and diluted (in shares)	10,551	10,457
Class B common share - diluted (in shares)	10,554	10,457
Net earnings per share, basic (in dollars per share)	$ 0.91	$ 1.43
Net earnings per share, diluted (in dollars per share)	$ 0.91	$ 1.43

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

+ References

+ Details

Note 11 - Income Taxes

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Income Tax Disclosure [Text Block]

11.

INCOME TAXES

The Company does not measure income tax expense for interim periods using the annual effective tax rate (“AETR”) method, as its estimated taxable income for future periods is not determined on a legal entity basis. The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various states and foreign jurisdictions. The Company is no longer subject to U.S. federal examinations by tax authorities for years prior to 2021 and state examinations for years prior to 2018. For foreign subsidiaries, the Company is generally no longer subject to tax examinations for years prior to 2015 in Asia and 2017 in Europe.

Due to the expiration of the statutes of limitations for certain jurisdictions, it is reasonably possible that unrecognized tax benefits related to previously filed tax returns may materially change from the amounts recorded as liabilities for uncertain tax positions in the Company’s condensed consolidated financial statements as of March 31, 2026. The Company’s liabilities for uncertain tax positions totaled $17.8 million as of March 31, 2026, compared to $17.5 million as of December 31, 2025. Approximately $2.0 million of these liabilities are expected to be resolved within the next twelve months due to statute expirations. These amounts, if recognized, would reduce the Company’s effective tax rate.

The Company’s policy is to recognize interest and penalties related to uncertain tax positions as a component of the current provision for income taxes. For the three months ended March 31, 2026 and 2025, the Company recognized $0.1 million in each period, in interest and penalties in the condensed consolidated statements of operations. As of March 31, 2026, the Company had accrued approximately $1.2 million for the payment of interest and penalties, compared to $1.1 million as of December 31, 2025. These amounts are included in liability for uncertain tax positions in the condensed consolidated balance sheets.

- Definition

The entire disclosure for income tax.

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-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

Note 6 - Inventories (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	March 31,		December 31,
	2026		2025
Raw materials	$	81,862	$	73,629
Work in progress		59,886		58,076
Finished goods		39,486		35,565
Inventories	$	181,234	$	167,270

Note 3 - Revenue

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Revenue from Contract with Customer [Text Block]

3.	REVENUE

The following table provides information about disaggregated revenue by geographic region and sales channel, and includes a reconciliation of the disaggregated revenue to our reportable segments. See Note 15, “Segments,” for additional information regarding the Company’s current reportable segments and the recast of prior period segment information to conform to the current presentation:

	Three Months Ended March 31, 2026
	Aerospace, Defense & Rugged Solutions		Industrial Technology & Data Solutions		Consolidated

*By Geographic Region:*
North America	$	64,178	$	50,174	$	114,352
EMEA		33,080		15,493		48,573
Asia		2,563		13,003		15,566
	$	99,821	$	78,670	$	178,491

*By Sales Channel:*
Direct to customer	$	76,087	$	54,987	$	131,074
Through distribution		23,734		23,683		47,417
	$	99,821	$	78,670	$	178,491

	Three Months Ended March 31, 2025
	Aerospace, Defense & Rugged Solutions		Industrial Technology & Data Solutions		Consolidated

*By Geographic Region:*
North America	$	55,060	$	41,211	$	96,271
Europe		25,108		15,709		40,817
Asia		2,954		12,196		15,150
	$	83,122	$	69,116	$	152,238

*By Sales Channel:*
Direct to customer	$	63,818	$	45,622	$	109,440
Through distribution		19,304		23,494		42,798
	$	83,122	$	69,116	$	152,238

The balances of the Company’s contract assets and contract liabilities at March 31, 2026 and December 31, 2025 are as follows:

	March 31,		December 31,
	2026		2025
Contract assets - current (unbilled receivables)	$	9,383	$	9,747
Contract liabilities - current (deferred revenue)	$	8,540	$	9,767
Accounts receivable, net	$	120,036	$	121,490

The change in the balance of the Company’s unbilled receivables from December 31, 2025 to March 31, 2026 primarily reflects a timing difference between (i) when the Company satisfies its performance obligation (i.e., when product is shipped to a customer-controlled hub and control transfers in accordance with the applicable contract terms) and (ii) when the Company has an unconditional right to invoice the customer under the contractual invoicing provisions (i.e., when the customer withdraws (“pulls”) product from the customer-controlled hub). Accordingly, unbilled receivables represent amounts for which revenue has been recognized but which are not yet billable, and are expected to be billed as customers withdraw product from the hub.

The Company’s contract liabilities (deferred revenue) at December 31, 2025 and March 31, 2026 primarily relate to customer prepayments and advance billings for which revenue has not yet been recognized. Revenue is recognized upon shipment (or otherwise upon transfer of control) of the related goods in accordance with the Company’s revenue recognition policy. Contract liabilities are classified as current and are included in other current liabilities. For the three months ended March 31, 2026, contract liabilities decreased by approximately $1.2 million to $8.5 million, from $9.8 million at December 31, 2025, reflecting $22.1 million of customer prepayments and advance billings recorded during the period, partially offset by $23.3 million of revenue recognized that was included in contract liabilities at the beginning of the period and/or recorded during the period.

Transaction Price Allocated to Future Obligations

The aggregate amount of transaction price allocated to remaining performance obligations that have not been fully satisfied as of March 31, 2026 related to contracts that exceed one year in duration amounted to $22.4 million, with expected contract expiration dates that range from 2027 – 2031. Based on the Company's current estimates, it is expected that approximately $4.2 million of this aggregate amount will be recognized in 2027, $0.3 million will be recognized in 2028, and $17.9 million will be recognized in the years beyond 2028. The majority of the Company's orders received (but not yet shipped) at March 31, 2026 are related to contracts that have an original expected duration of one year or less, for which the Company is electing to utilize the practical expedient available within the applicable guidance, and are excluded from the transaction price related to these future obligations. The Company will generally satisfy the remaining performance obligations as we transfer control of the products ordered to our customers.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-15

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

Note 13 - Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2026

Mar. 31, 2025

Balance

$ 425,513

Other comprehensive income (loss)

836

$ (1,864)

Balance

438,942

Accumulated Foreign Currency Adjustment Attributable to Parent [Member]

Balance

(19,490)

Other comprehensive (loss) income before reclassifications

1,282

Amount reclassified from accumulated other comprehensive loss

^[1]

(139)

Other comprehensive income (loss)

1,143

Balance

(18,347)

Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]

Balance

906

Other comprehensive (loss) income before reclassifications

Amount reclassified from accumulated other comprehensive loss

^[1]

(364)

Other comprehensive income (loss)

(296)

Balance

610

AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]

Balance

Other comprehensive (loss) income before reclassifications

(1)

Amount reclassified from accumulated other comprehensive loss

^[1]

Other comprehensive income (loss)

(1)

Balance

Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]

Balance

1,389

Other comprehensive (loss) income before reclassifications

(6)

Amount reclassified from accumulated other comprehensive loss

^[1]

(4)

Other comprehensive income (loss)

(10)

Balance

1,379

AOCI Attributable to Parent [Member]

Balance

(17,174)

Other comprehensive (loss) income before reclassifications

1,343

Amount reclassified from accumulated other comprehensive loss

^[1]

(507)

Other comprehensive income (loss)

836

Balance

$ (16,338)

[1]	This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP. This expense is reflected in other income (expense), net on the accompanying condensed consolidated statements of operations.

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
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-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Subparagraph (SX 210.4-08(g)(1)(i))
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Subparagraph (f)
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(19))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (SX 210.6-05(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-2

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(4)(b))
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
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-Paragraph 3
-Subparagraph (SX 210.6-09(7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 14: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480418/310-10-S99-2

+ Details

Note 8 - Accrued Expenses (Details Textual) $ in Millions	3 Months Ended
Note 8 - Accrued Expenses (Details Textual) $ in Millions	Mar. 31, 2026 USD ($)
Product Warranty Expense	$ 0.1

Note 15 - Segments (Details Textual)	3 Months Ended
Note 15 - Segments (Details Textual)	Mar. 31, 2026
Number of Industry in which Entity Operates	1
Number of Reportable Segments	2

Note 8 - Accrued Expenses - Activity and Liability Balances Related to Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Accrued restructuring costs	$ 439		$ 759
Restructuring charges	76	$ (2,933)
Cash payment and other settlements	(396)
Employee Severance [Member]
Accrued restructuring costs	116		85
Restructuring charges	76
Cash payment and other settlements	(45)
Other Restructuring [Member]
Accrued restructuring costs	323		$ 674
Restructuring charges	0
Cash payment and other settlements	$ (351)

Note 9 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2023	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Foreign Exchange Forward [Member]
Derivative, Notional Amount		$ 55.6	$ 49.6
The 2021 Swaps One [Member]
Derivative, Notional Amount				$ 30.0
Derivative, Fixed Interest Rate	1.334%
Derivative, Basis Spread on Variable Rate	10.00%
The 2021 Swaps Two [Member]
Derivative, Notional Amount			$ 30.0
Derivative, Fixed Interest Rate	1.348%
Derivative, Basis Spread on Variable Rate	10.00%

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current Assets:
Cash and cash equivalents	$ 59,446	$ 57,800
Accounts receivable, net of allowance of $825 and $671, respectively	120,036	121,490
Inventories	181,234	167,270
Unbilled receivables	9,383	9,747
Other current assets	27,053	28,454
Total current assets	397,152	384,761
Property, plant and equipment, net	48,479	48,428
Right-of-use assets	20,761	22,868
Intangible assets, net	214,141	217,966
Goodwill, net	224,812	214,821
Deferred income taxes	14,097	12,843
Other assets	32,478	33,513
Total assets	951,920	935,200
Current Liabilities:
Accounts payable	63,965	52,990
Accrued expenses	42,727	49,710
Operating lease liabilities, current	7,228	8,029
Other current liabilities	10,828	16,716
Total current liabilities	124,748	127,445
Long-term Liabilities:
Long-term debt	204,500	197,500
Operating lease liabilities, long-term	14,420	15,867
Liability for uncertain tax positions	17,810	17,524
Minimum pension obligation and unfunded pension liability	19,360	19,303
Deferred income taxes	28,040	29,684
Other long-term liabilities	7,334	9,203
Total liabilities	416,212	416,526
Commitments and contingencies (see Note 15)
Redeemable noncontrolling interest	(96,766)	(93,161)
Shareholders' Equity:
Preferred stock, no par value, 1,000,000 shares authorized; none issued	0	0
Additional paid-in capital	40,386	38,315
Retained earnings	413,618	403,102
Accumulated other comprehensive loss	(16,338)	(17,174)
Total shareholders' equity	438,942	425,513
Total liabilities, redeemable noncontrolling interest and shareholders' equity	951,920	935,200
Common Class A [Member]
Shareholders' Equity:
Common Stock	212	212
Common Class B [Member]
Shareholders' Equity:
Common Stock	$ 1,064	$ 1,058

Note 10 - Debt (Details Textual) - USD ($) $ in Millions	3 Months Ended
Note 10 - Debt (Details Textual) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Revolving Credit Facility [Member]
Long-Term Line of Credit	$ 204.5		$ 197.5
Credit and Security Agreement with KeyBank [Member]
Interest Expense, Debt	2.5	$ 4.2
Long-Term Debt, Percentage Bearing Fixed Interest, Amount	$ 60.0
Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate	2.59%		2.59%
Long-Term Debt, Percentage Bearing Variable Interest, Amount	$ 144.5		$ 137.5
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.54%		3.63%
Debt Instrument, Interest Rate, Effective Percentage	4.30%		4.42%
Debt Instrument, Interest Rate, Stated Percentage	5.01%		5.21%
Credit and Security Agreement with KeyBank [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 400.0
Line of Credit Facility, Remaining Borrowing Capacity	$ 195.5		$ 202.5

Note 15 - Segments - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Total Assets	$ 951,920	$ 584,417	$ 935,200
Capital Expenditures	2,643	2,790
Depreciation and Amortization Expense	6,624	6,684
Interest expense	2,530	4,152
Operating Segments [Member]
Total Assets	890,247	877,582
Capital Expenditures	2,588	2,785
Depreciation and Amortization Expense	6,472	6,545
Interest expense	15	115
Operating Segments [Member] \| Aerospace, Defense, and Rugged Solutions Segment [Member]
Total Assets	665,868	647,325
Capital Expenditures	2,012	1,173
Depreciation and Amortization Expense	4,830	5,010
Interest expense	0	14
Operating Segments [Member] \| Industrial Technology and Data Solutions Segment [Member]
Total Assets	224,379	230,257
Capital Expenditures	576	1,612
Depreciation and Amortization Expense	1,642	1,535
Interest expense	15	101
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Total Assets	61,673	(293,165)
Capital Expenditures	55	5
Depreciation and Amortization Expense	152	139
Interest expense	$ 2,515	$ 4,037

- Definition

Amount of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480070/505-10-S50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 30
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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+ Details

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

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+ Details

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net sales	$ 178,491	$ 152,238
Cost of sales	108,893	93,419
Gross profit	69,598	58,819
Research and development costs	8,507	7,222
Selling, general and administrative expenses	36,730	29,507
Restructuring charges	76	(2,933)
Earnout liability adjustment	619	0
Income from operations	23,666	25,023
Interest expense	(2,530)	(4,152)
Interest income	150	275
Other (expense) income, net	(3,494)	2,639
Earnings before provision for income taxes	17,792	23,785
Provision for income taxes	2,808	5,463
Net earnings available to common shareholders	14,984	18,322
Less: Net earnings attributable to noncontrolling interest	972	838
Redemption value adjustment attributable to noncontrolling interest	2,633	(390)
Net earnings attributable to Bel Fuse shareholders	$ 11,379	$ 17,874
Common Class A [Member]
Net earnings per common share:
Class A common share - basic and diluted (in dollars per share)	$ 0.86	$ 1.36
Weighted-average number of shares outstanding:
Class A common share - basic and diluted (in shares)	2,115	2,115
Common Class B [Member]
Net earnings per common share:
Class A common share - basic and diluted (in dollars per share)	$ 0.91	$ 1.43
Class B common share - diluted (in dollars per share)	$ 0.91	$ 1.43
Weighted-average number of shares outstanding:
Class A common share - basic and diluted (in shares)	10,551	10,457
Class B common share - diluted (in shares)	10,554	10,457

Note 6 - Inventories

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Inventory Disclosure [Text Block]

6.	INVENTORIES

The components of inventories are as follows:

	March 31,		December 31,
	2026		2025
Raw materials	$	81,862	$	73,629
Work in progress		59,886		58,076
Finished goods		39,486		35,565
Inventories	$	181,234	$	167,270

Note 4 - Earnings Per Share

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Earnings Per Share [Text Block]

4.	EARNINGS PER SHARE

The following table sets forth the calculation of basic and diluted net earnings per common share under the two-class method for the three months ended March 31, 2026 and 2025:

	Three Months Ended
	March 31,
	2026		2025

Numerator:
Net earnings	$	11,379	$	17,874
Less dividends declared:
Class A		127		127
Class B		736		737
Undistributed earnings	$	10,516	$	17,010

Undistributed earnings allocation:
Class A undistributed earnings	$	1,686	$	2,748
Class B undistributed earnings		8,830		14,262
Total undistributed earnings	$	10,516	$	17,010

Net earnings allocation:
Class A net earnings	$	1,813	$	2,875
Class B net earnings		9,566		14,999
Net earnings	$	11,379	$	17,874

Denominator:
Weighted-average shares outstanding:
Class A - Basic and Diluted		2,115		2,115
Class B - Basic		10,551		10,457
Class B - Diluted		10,554		10,457

Net earnings per share:
Class A - Basic and Diluted	$	0.86	$	1.36
Class B - Basic	$	0.91	$	1.43
Class B - Diluted	$	0.91	$	1.43

Note 13 - Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Comprehensive Income (Loss) Note [Text Block]

13.

ACCUMULATED OTHER COMPREHENSIVE LOSS

The components of accumulated other comprehensive loss at March 31, 2026 and December 31, 2025 are summarized below:

	March 31,			December 31,
	2026			2025

Foreign currency translation adjustment, net of taxes of ($312) at March 31, 2026 and ($312) at December 31, 2025	$	(18,347	)	$	(19,490	)
Unrealized gains on interest rate swap cash flow hedge, net of taxes of $0 at March 31, 2026 and $0 at December 31, 2025		610			906
Unrealized holding gains on marketable securities, net of taxes of ($7) at March 31, 2026 and ($7) at December 31, 2025		20			21
Unfunded SERP liability, net of taxes of $1,000 at March 31, 2026 and $1,003 at December 31, 2025		1,379			1,389

Accumulated other comprehensive loss	$	(16,338	)	$	(17,174	)

Changes in accumulated other comprehensive loss by component during the three months ended March 31, 2026 are as set forth below. All amounts are net of tax:

							Unrealized
	Foreign			Unrealized Gains			Holding
	Currency			on Interest Rate			Gains on
	Translation			Swap Cash			Marketable			Unfunded
	Adjustment			Flow Hedge			Securities			SERP Liability				Total

Balance at December 31, 2025	$	(19,490	)	$	906		$	21		$	1,389			$	(17,174	)
Other comprehensive (loss) income before reclassifications		1,282			68			(1	)		(6	)			1,343
Amount reclassified from accumulated other comprehensive loss		(139	)		(364	)		-			(4	)	(a)		(507	)
Net current period other comprehensive (loss) income		1,143			(296	)		(1	)		(10	)			836

Balance at March 31, 2026	$	(18,347	)	$	610		$	20		$	1,379			$	(16,338	)

(a) This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP. This expense is reflected in other income (expense), net on the accompanying condensed consolidated statements of operations.

Note 12 - Retirement, Savings and Deferred Compensation Plans - Components of SERP Expense (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Service cost	$ 80	$ 71
Interest cost	241	240
Net amortization	(11)	(35)
Net periodic benefit cost	$ 310	$ 276

Note 2 - Acquisition (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	Sep. 18, 2024	Mar. 31, 2026	Jan. 01, 2027	Dec. 31, 2025	Nov. 14, 2024
dataMate [Member]
Business Combination, Consideration Transferred		$ 16,000
Enercon Technologies, Ltd [Member]
Business Acquisition, Percentage of Voting Interests Acquired					80.00%
Business Combination, Price of Acquisition, Expected	$ 320,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High					$ 10,000
Redeemable Noncontrolling Interest, Equity, Fair Value		96,800		$ 93,200	72,400
Enercon Technologies, Ltd [Member] \| Earnout Payment [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High					5,000
Business Combination, Contingent Consideration, Liability					3,300
Payment for Contingent Consideration Liability, Investing Activities		$ 5,000
Enercon Technologies, Ltd [Member] \| Forecast [Member]
Business Acquisition, Percentage of Voting Interests Acquired			20.00%
Enercon Technologies, Ltd [Member] \| Full Achievement of Earnout [Member] \| Earnout Payment [Member]
Business Combination, Contingent Consideration, Liability					5,000
Enercon Technologies, Ltd [Member] \| Above 90% and Less Than 100% Achievement of Earnout [Member] \| Earnout Payment [Member]
Business Combination, Contingent Consideration, Liability					2,500
Enercon Technologies, Ltd [Member] \| Less than 90% of Earnout [Member] \| Earnout Payment [Member]
Business Combination, Contingent Consideration, Liability					$ 0

Note 9 - Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Derivative Instruments, Gain (Loss) [Table Text Block]

	Three Months Ended
	March 31,
	2026		2025
Net gains (losses) recognized in AOCL:
Foreign currency forward contracts	$	343	$	29
Interest rate swap agreements		68		(124	)
	$	411	$	(95	)

Net gains (losses) reclassified from AOCL to the consolidated statement of operations:
Foreign currency forward contracts	$	139	$	(57	)
Interest rate swap agreements		364		465
	$	503	$	408

Derivatives Not Designated as Hedging Instruments [Table Text Block]

		Three Months Ended
		March 31,
	Classification in Consolidated Statements of Operations	2026		2025
Foreign currency forward contracts	Other (expense) income, net	$	893	$	(285	)
		$	893	$	(285	)

Note 12 - Retirement, Savings and Deferred Compensation Plans (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) shares	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Supplemental Employee Retirement Plan [Member]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 0.1	$ 0.1
Bel Fuse Inc. Employees' Savings Plan [Member]
Defined Contribution Plan, Cost	$ 0.7	$ 0.4
Bel Fuse Inc. Employees' Savings Plan [Member] \| Common Class A [Member]
Shares Held in Plan (in shares) \| shares	217,238
Bel Fuse Inc. Employees' Savings Plan [Member] \| Common Class B [Member]
Shares Held in Plan (in shares) \| shares	45,561
Nonqualified Deferred Compensation Plan [Member]
Deferred Compensation Arrangement, Vesting Age			65
Deferred Compensation Plan Assets	$ 1.7		$ 1.7

Note 2 - Acquisition

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Business Combination [Text Block]

2.	ACQUISITIONS

Acquisition of dataMate

During the first quarter of 2026, we completed the acquisition of dataMate (“dataMate”), a provider of Ethernet and broadband connectivity solutions, from Methode Electronics, Inc. for aggregate consideration of approximately $16.0 million, subject to customary post-closing adjustments. The acquisition was funded using cash on hand and borrowings under our revolving credit facility. The acquisition was accounted for as a business combination under ASC 805, Business Combinations. The acquisition is expected to broaden Bel’s customer reach and increase exposure to attractive end markets, including networking, data centers, industrial automation, smart buildings and broadband deployment, while providing additional U.S.-based manufacturing and R&D capabilities. Bel also believes the acquisition provides opportunities to leverage dataMate’s ongoing technology development, including solutions intended to deliver data and power over a single pair of wires, to support future product expansion. No separate fair value step-up was recorded for inventory or identifiable intangible assets; accordingly, any such value was included in goodwill. The purchase price allocation is preliminary and is subject to change as additional information becomes available, including as valuation work related to acquired intangible assets is finalized. The results of operations of dataMate have been included in our condensed consolidated financial statements from the acquisition date. The contribution of dataMate to our net sales and operating income was not material during the three months ended March 31, 2026.

	Preliminary
	Acquisition Date
	(as adjusted)
Accounts receivable	$	2,704
Inventories		2,540
Other current assets		205
Total identifiable assets		5,449

Net Fixed Assets		609
Goodwill		10,464
Net assets acquired		16,522


Working Capital Liabilities		1,298
Total consideration paid	$	15,224

The results of operations of dataMate have been included in the Company’s condensed consolidated financial statements for periods subsequent to the acquisition date of March 5, 2026. The following unaudited pro forma information presents the combined results of operations of the Company and dataMate as if the acquisition had occurred on January 1, 2025, as applicable to the periods presented. The unaudited pro forma information is presented for illustrative purposes only and is not necessarily indicative of the results of operations that would have been achieved had the acquisition occurred on the assumed date, nor is it intended to be a projection of future results. The unaudited pro forma information reflects adjustments that are directly attributable to the acquisition, factually supportable, and, with respect to the statements of operations, expected to have a continuing impact. The unaudited pro forma information does not reflect the realization of any anticipated cost savings, synergies, or operating efficiencies that may result from the acquisition, nor does it reflect any nonrecurring integration-related costs that may be incurred, while certain cost savings may result from the acquisition, there can be no assurance that such cost savings will be achieved.

	Three Months Ended March 31,		Three Months Ended March 31,
	2026		2025
Revenue, net	$	180,817	$	156,224
Net earnings		15,426		18,694
Less: Net earnings attributable to non-controlling interest		3,605		448
Net earnings attributable to Bel Fuse shareholders	$	11,821	$	18,246
Earnings per Class A common share - basic and diluted	$	0.89	$	1.39
Earnings per Class A common share - basic	$	0.94	$	1.46
Earnings per Class B common share - diluted	$	0.94	$	1.46

Acquisition of Enercon

On November 14, 2024, the Company closed on its acquisition of its majority 80% stake in Enercon Technologies, Ltd. (“Enercon”), pursuant to the terms of the Share Purchase Agreement, dated as of September 19, 2024 (the “Purchase Agreement”), by and among the Company, Enercon, and FF3 Holdings, L.P., for itself and as Sellers’ Representative (“FF3”), and each of the other seller parties signatory thereto (collectively with FF3, the “Sellers”). Enercon is a leading supplier of highly customized power conversion and networking solutions to aerospace and defense markets globally, providing robust and reliable solutions across air, land and sea applications. Enercon is based in Netanya, Israel with additional facilities in New Hampshire, U.S. and Haryana, India.

Under the terms of the Purchase Agreement, on November 14, 2024, closing date (and deemed effective solely for accounting purposes as of November 1, 2024), Bel acquired from the Sellers 80% of the issued and outstanding share capital of Enercon on a fully-diluted basis for (i) a cash purchase price of $320 million (subject to customary adjustments), plus (ii) up to $10 million in potential earnout payments for the 2025 - 2026 period (the “Earnout Payments”), as further described below (the “Transaction” or the "acquisition"). Bel may acquire the remaining 20% stake in Enercon and has the current intention to purchase such remaining interest by early 2027 in accordance with the terms and subject to the conditions of a shareholders’ agreement, which was also entered into on November 14, 2024.

The potential Earnout Payments may become payable of up to $5 million for each of the fiscal 2025 and fiscal 2026 earnout periods (each, an “Earnout Period”), subject to Enercon’s achievement of certain specified EBITDA targets for each respective Earnout Period, as calculated and determined in accordance with the Purchase Agreement. In the event that (i) the target for the respective Earnout Period has been achieved, the full $5 million Earnout Payment for the Earnout Period shall be payable, or (ii) achievement for the respective Earnout Period is at least 90% of the target level but less than 100% of the target level, then the amount payable in respect of the Earnout Payment for such Earnout Period shall be $2.5 million. In the event that achievement for the respective Earnout Period is less than 90% of the target level, no Earnout Payment shall be due for such period. The Earnout Payment associated with fiscal year 2025 was achieved in full and the Company paid $5 million to the Sellers during the first quarter of 2026 in connection with the 2025 earnout achievement.

The acquisition of Enercon resulted in a noncontrolling interest holder who is entitled to a put option, giving the sellers the ability to put their redeemable interest in the shares of the acquiree to the Company. Specifically, if exercised by the noncontrolling interest holder, the Company would be required to purchase the remaining 20% of the Seller's redeemable interest, at a redemption price during specified time period(s) stipulated in the Enercon acquisition agreement. The Company also has a corresponding call option with respect to the noncontrolling interest. Upon acquisition, the redeemable noncontrolling interest was initially valued at a fair value of $72.4 million. The redeemable noncontrolling interest reflected on the accompanying condensed consolidated balance sheets at March 31, 2026 and December 31, 2025 will remain in temporary equity until the applicable put-call option is either fully exercised or expires. At March 31, 2026 and December 31, 2025, the redeemable noncontrolling interest was adjusted to reflect its redemption value of $96.8 million and $93.2 million, respectively. The redemption value of the redeemable noncontrolling interest is generally calculated using Level 3 unobservable inputs based on a multiple of earnings. A roll-forward of the redeemable noncontrolling interest for the three months ending March 31, 2026 is included in the accompanying condensed consolidated statements of shareholders' equity and redeemable noncontrolling interest.

- Definition

The entire disclosure for business combination.

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+ Details

Condensed Consolidated Statements of Shareholders' Equity and Redeemable Noncontrolling Interest (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Class A [Member] Retained Earnings [Member]	Common Class A [Member] Common Stock Outstanding [Member]	Common Class A [Member] Noncontrolling Interest [Member]	Common Class A [Member]	Common Class B [Member] Retained Earnings [Member]	Common Class B [Member] Common Stock Outstanding [Member]	Common Class B [Member] Noncontrolling Interest [Member]	Common Class B [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Additional Paid-in Capital [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2024		$ 212				$ 1,046			$ 345,031	$ (17,227)	$ 31,514	$ 80,586	$ 360,576
Balance (in shares) at Dec. 31, 2024		2,115				10,425
Redemption value adjustment attributable to noncontrolling interest									(0)			390
Net earnings									17,874			838	17,874
Cash dividends declared on common stock	$ (127)			$ (127)	$ (737)			$ (737)
Issuance of restricted common stock						$ 13					(13)
Issuance of restricted common stock (in shares)						129
Forfeiture of restricted common stock (in shares)						(2)
Unrealized holding losses on marketable securities, net of taxes of $0 in all periods presented													0
Foreign currency translation adjustment, net of taxes										(1,248)			(1,248)
Unrealized losses on interest rate swap cash flow hedge, net of taxes of $0 in all periods presented		$ 0				$ 0			0	(588)	0	0	(588)
Stock-based compensation expense											1,179		1,179
Change in unfunded SERP liability, net of taxes										(28)			(28)
Balance at Mar. 31, 2025		$ 212				$ 1,059			362,041	(19,091)	32,680	81,034	376,901
Balance (in shares) at Mar. 31, 2025		2,115				10,552
Redemption value adjustment attributable to noncontrolling interest									0			(390)
Balance at Dec. 31, 2025		$ 212				$ 1,058			403,102	(17,174)	38,315	93,161	425,513
Balance (in shares) at Dec. 31, 2025		2,115				10,543
Redemption value adjustment attributable to noncontrolling interest										0		2,633
Net earnings									11,379			972	11,379
Cash dividends declared on common stock	$ (127)		$ 0	$ (127)	$ (736)		$ 0	$ (736)
Issuance of restricted common stock						$ 6					(6)		0
Issuance of restricted common stock (in shares)						53
Forfeiture of restricted common stock (in shares)						(1)
Forfeiture of restricted common stock													0
Issuance of shares upon vesting of Performance Stock Units		$ 0							0	0		0
Unrealized holding losses on marketable securities, net of taxes of $0 in all periods presented						$ 12				(1)		0	(1)
Foreign currency translation adjustment, net of taxes										1,143		0	1,143
Unrealized losses on interest rate swap cash flow hedge, net of taxes of $0 in all periods presented										(296)		0	(296)
Stock-based compensation expense											2,077		2,077
Change in unfunded SERP liability, net of taxes										(10)			(10)
Balance at Mar. 31, 2026		$ 212				$ 1,064			$ 413,618	(16,338)	$ 40,386	96,766	$ 438,942
Balance (in shares) at Mar. 31, 2026		2,115				10,607
Redemption value adjustment attributable to noncontrolling interest										$ 0		$ (2,633)

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Foreign currency translation adjustment, tax expense	$ 0	$ 0
Unrealized losses (gain) on interest rate swap cash flow hedge, tax	0	0
Unrealized gain on marketable securities arising during the period, tax	0	0
Change in unfunded SERP liability, tax	$ 3	$ 8

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Accounts receivable, allowance for doubtful accounts	$ 825	$ 671
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0.1	$ 0.1
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares outstanding (in shares)	2,115,263	2,115,263
Common stock, treasury shares (in shares)	1,072,769	1,072,769
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.1	$ 0.1
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares outstanding (in shares)	10,607,444	10,543,368
Common stock, treasury shares (in shares)	3,218,307	3,218,307

Note 3 - Revenue (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended March 31, 2026
	Aerospace, Defense & Rugged Solutions		Industrial Technology & Data Solutions		Consolidated

*By Geographic Region:*
North America	$	64,178	$	50,174	$	114,352
EMEA		33,080		15,493		48,573
Asia		2,563		13,003		15,566
	$	99,821	$	78,670	$	178,491

*By Sales Channel:*
Direct to customer	$	76,087	$	54,987	$	131,074
Through distribution		23,734		23,683		47,417
	$	99,821	$	78,670	$	178,491

	Three Months Ended March 31, 2025
	Aerospace, Defense & Rugged Solutions		Industrial Technology & Data Solutions		Consolidated

*By Geographic Region:*
North America	$	55,060	$	41,211	$	96,271
Europe		25,108		15,709		40,817
Asia		2,954		12,196		15,150
	$	83,122	$	69,116	$	152,238

*By Sales Channel:*
Direct to customer	$	63,818	$	45,622	$	109,440
Through distribution		19,304		23,494		42,798
	$	83,122	$	69,116	$	152,238

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

	March 31,		December 31,
	2026		2025
Contract assets - current (unbilled receivables)	$	9,383	$	9,747
Contract liabilities - current (deferred revenue)	$	8,540	$	9,767
Accounts receivable, net	$	120,036	$	121,490

Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2026

Accounting Policies [Abstract]

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Adopted Accounting Standards

Accounting Standards Issued But Not Yet Adopted

Note 9 - Derivative Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Derivative Instruments and Hedging Activities Disclosure [Text Block]

9.	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Our primary objective for holding derivative financial instruments is to manage foreign currency exchange rate risk and interest rate risk, when deemed appropriate. We enter into these contracts in the normal course of business to mitigate risks and not for speculative purposes.

Foreign Currency Forward Contracts

Under our risk management strategy, we periodically use foreign currency forward contracts to manage our short-term exposures to fluctuations in operational cash flows resulting from changes in foreign currency exchange rates. These cash flow exposures result from portions of our forecasted operating expenses, primarily compensation and related expenses, which are transacted in currencies other than the U.S. dollar, most notably the Chinese renminbi, Mexican peso and Israeli shekel. These foreign currency forward contracts generally have maturities of no longer than twelve months, although occasionally we will execute a contract that extends beyond twelve months, depending upon the nature of the underlying risk.

We held outstanding foreign currency forward contracts with notional amounts of $55.6 million and $49.6 million as of March 31, 2026 and December 31, 2025, respectively. The Company's foreign currency forward contracts related to the Chinese renminbi are designated as cash flow hedges for accounting purposes and as such, changes in their fair value are recognized in accumulated other comprehensive loss in the consolidated balance sheet and are reclassified into the statement of operations within cost of goods sold in the period in which the hedged transaction affects earnings.

Interest Rate Swap Agreements

To partially mitigate risks associated with the variable interest rates on the revolver borrowings under our Credit Agreement (as defined and described in Note 10, "Debt", below), in November 2021, we executed a pay-fixed, receive-variable interest rate swap agreement with each of two multinational financial institutions under which we (i) pay interest at a fixed rate of 1.334% and received variable interest of the daily SOFR rate plus 10 basis points on a notional amount of $30.0 million and (ii) paid interest at a fixed rate of 1.348% and received variable interest of the daily SOFR rate plus 10 basis points on a notional amount of $30.0 million (the “2021 Swaps”). The effective date of the 2021 Swaps was December 31, 2021, and settlements with the counterparties began on January 31, 2022 and occur on a monthly basis. The 2021 Swaps will terminate on August 31, 2026.

The 2021 Swaps are designated as cash flow hedges for accounting purposes and as such, changes in their fair value are recognized in accumulated other comprehensive loss in the consolidated balance sheet and are reclassified into the statement of operations within interest expense in the period in which the hedged transaction affects earnings.

Fair Values of Derivative Financial Instruments

See Note 5, "Fair Value Measurements" for the gross fair values of the Company's derivative assets and liabilities as of March 31, 2026 and December 31, 2025.

Derivative Financial Instruments in Cash Flow Hedging Relationships

The effects of derivative financial instruments designated as cash flow hedges on accumulated other comprehensive loss (“AOCL”) and on the condensed consolidated statements of operations for the three months ended March 31, 2026 and 2025 were as follows:

	Three Months Ended
	March 31,
	2026		2025
Net gains (losses) recognized in AOCL:
Foreign currency forward contracts	$	343	$	29
Interest rate swap agreements		68		(124	)
	$	411	$	(95	)

Net gains (losses) reclassified from AOCL to the consolidated statement of operations:
Foreign currency forward contracts	$	139	$	(57	)
Interest rate swap agreements		364		465
	$	503	$	408

The gains and losses related to the foreign currency forward contracts are included as a component of currency translation adjustment on the accompanying condensed consolidated statements of comprehensive income for the three months ended March 31, 2026 and 2025.

Derivative Financial Instruments Not Designated as Hedging Instruments

Gains (losses) recognized on derivative financial instruments not designated as hedging instruments in our condensed consolidated statements of operations for the three months ended March 31, 2026 and 2025 were as follows:

		Three Months Ended
		March 31,
	Classification in Consolidated Statements of Operations	2026		2025
Foreign currency forward contracts	Other (expense) income, net	$	893	$	(285	)
		$	893	$	(285	)

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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+ Details

Note 2 - Acquisition (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block]

	Preliminary
	Acquisition Date
	(as adjusted)
Accounts receivable	$	2,704
Inventories		2,540
Other current assets		205
Total identifiable assets		5,449

Net Fixed Assets		609
Goodwill		10,464
Net assets acquired		16,522


Working Capital Liabilities		1,298
Total consideration paid	$	15,224

Business Combination, Pro Forma Information [Table Text Block]

	Three Months Ended March 31,		Three Months Ended March 31,
	2026		2025
Revenue, net	$	180,817	$	156,224
Net earnings		15,426		18,694
Less: Net earnings attributable to non-controlling interest		3,605		448
Net earnings attributable to Bel Fuse shareholders	$	11,821	$	18,246
Earnings per Class A common share - basic and diluted	$	0.89	$	1.39
Earnings per Class A common share - basic	$	0.94	$	1.46
Earnings per Class B common share - diluted	$	0.94	$	1.46

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net earnings available to common shareholders	$ 11,379	$ 17,874
Other comprehensive income (loss):
Currency translation adjustment, net of taxes of $0, and $0, respectively	1,143	(1,248)
Unrealized losses on interest rate swap cash flow hedge, net of taxes of $0 in all periods presented	(296)	(588)
Unrealized holding losses on marketable securities, net of taxes of $0 in all periods presented	(1)	0
Change in unfunded SERP liability, net of taxes of $3 and $8, respectively	(10)	(28)
Other comprehensive income (loss)	836	(1,864)
Comprehensive income	12,215	16,010
Comprehensive income attributable to noncontrolling interest	972	838
Comprehensive income attributable to Bel shareholders	$ 11,243	$ 15,172

Note 8 - Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

	March 31,		December 31,
	2026		2025
Salaries, bonuses and related benefits	$	27,810	$	37,426
Accrued restructuring costs		439		759
Sales commissions		2,848		2,375
Warranty accrual		1,167		1,245
Other		10,463		7,905
	$	42,727	$	49,710

Restructuring and Related Costs [Table Text Block]

			Three Months Ended
			March 31, 2026
	Liability at				Cash Payments			Liability at
	December 31,		New		and Other			March 31,
	2025		Charges		Settlements			2026
Severance costs	$	85	$	76	$	(45	)	$	116
Other restructuring costs		674		-		(351	)		323
Total	$	759	$	76	$	(396	)	$	439

Note 9 - Derivative Instruments and Hedging Activities - Derivative Financial Instruments Effects on Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net gains (losses) recognized in AOCL	$ 411	$ (95)
Net gains (losses) reclassified from AOCL to the consolidated statement of operations	503	408
Foreign Exchange Forward [Member]
Net gains (losses) recognized in AOCL	343	29
Net gains (losses) reclassified from AOCL to the consolidated statement of operations	139	(57)
Interest Rate Swap [Member]
Net gains (losses) recognized in AOCL	68	(124)
Net gains (losses) reclassified from AOCL to the consolidated statement of operations	$ 364	$ 465

Note 15 - Segments - Segmented Earnings Breakdown (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net sales	$ 178,491	$ 152,238
Cost of sales	108,893	93,419
Segment gross profit	$ 69,598	$ 58,819
Segment gross profit %	39.00%	38.60%
Research and development costs	$ 8,507	$ 7,222
Selling, general and administrative expenses	36,730	29,507
Restructuring charges	76	(2,933)
Earnout liability adjustment	619	0
Interest expense	2,530	4,152
Interest income	(150)	(275)
Other income, net	3,494	(2,639)
Earnings before provision for income taxes	17,792	23,785
Aerospace, Defense, and Rugged Solutions Segment [Member]
Net sales	99,821	83,122
Industrial Technology and Data Solutions Segment [Member]
Net sales	78,670	69,116
Operating Segments [Member]
Net sales	178,491	152,238
Cost of sales	108,346	93,130
Segment gross profit	$ 70,145	$ 59,108
Segment gross profit %	39.30%	38.80%
Interest expense	$ 15	$ 115
Operating Segments [Member] \| Aerospace, Defense, and Rugged Solutions Segment [Member]
Net sales	99,821	83,122
Cost of sales	58,443	49,794
Segment gross profit	$ 41,378	$ 33,328
Segment gross profit %	41.50%	40.10%
Interest expense	$ 0	$ 14
Operating Segments [Member] \| Industrial Technology and Data Solutions Segment [Member]
Net sales	78,670	69,116
Cost of sales	49,903	43,336
Segment gross profit	$ 28,767	$ 25,780
Segment gross profit %	36.60%	37.30%
Interest expense	$ 15	$ 101
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Segment gross profit	(547)	(289)
Interest expense	$ 2,515	$ 4,037

Note 12 - Retirement, Savings and Deferred Compensation Plans

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Retirement Benefits [Text Block]

12.

RETIREMENT, SAVINGS AND DEFERRED COMPENSATION PLANS

The Company maintains the Bel Fuse Inc. Employees’ Savings Plan, a defined contribution plan that is intended to meet the applicable requirements for tax-qualification under sections 401(a) and (k) of the Internal Revenue Code. The expense for the three months ended March 31, 2026 and 2025 amounted to $0.7 million and $0.4 million, respectively. The Company’s matching contribution is made in the form of Bel Class A common stock. As of March 31, 2026, the plan owned 217,238 and 45,561 shares of Bel Class A and Class B common stock, respectively.

The Company also maintains a Nonqualified Deferred Compensation Plan (the "DCP"). With certain exceptions, the Company's contributions to the DCP are discretionary and become fully vested by the participants upon reaching age 65. The expense for the three months ended March 31, 2026 and 2025 amounted to less than $0.1 million during each period. As the plan is fully funded, the assets and liabilities related to the DCP were in equal amounts of $1.7 million at March 31, 2026 and $1.7 million at December 31, 2025. These amounts are included in other assets and other liabilities, respectively, on the accompanying condensed consolidated balance sheets as of each date.

The Company’s subsidiaries in Asia maintain a retirement fund that covers substantially all Hong Kong-based full-time employees. Retirement fund expense for the three months ended March 31, 2026 and 2025 amounted to less than $0.1 million, in each period.

The Company maintains a SERP, which is designed to provide a limited group of key management and other key employees of the Company with supplemental retirement and death benefits. As discussed in Note 5, "Fair Value Measurements", above, the Company has investments in a rabbi trust which are intended to fund the obligations of the SERP.

The components of SERP expense are as follows:

	Three Months Ended
	March 31,
	2026			2025
Service cost	$	80		$	71
Interest cost		241			240
Net amortization		(11	)		(35	)
Net periodic benefit cost	$	310		$	276

The service cost component of net benefit cost is presented within cost of sales, research and development costs or selling, general and administrative expense on the accompanying condensed consolidated statements of operations, in accordance with where compensation cost for the related associate is reported. All other components of net benefit cost, including interest cost and net amortization noted above, are presented within other income (expense), net in the accompanying condensed consolidated statements of operations.

The following amounts are recognized net of tax in accumulated other comprehensive loss:

	March 31,			December 31,
	2026			2025
Prior service cost	$	46		$	55
Net loss		(3,065	)		(3,085	)
	$	(3,019	)	$	(3,030	)

- Definition

The entire disclosure for retirement benefits.

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