Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Net sales	$ 152,238	$ 128,090
Cost of sales	93,419	80,012
Gross profit	58,819	48,078
Research and development costs	7,222	5,215
Selling, general and administrative expenses	29,507	24,944
Restructuring charges	(2,933)	65
Income from operations	25,023	17,854
Interest expense	(4,152)	(434)
Interest income	275	1,115
Other income, net	2,639	1,817
Earnings before provision for income taxes	23,785	20,352
Provision for income taxes	5,463	4,478
Net earnings available to common stockholders	18,322	15,874
Less: Net earnings attributable to noncontrolling interest	838	0
Redemption value adjustment attributable to noncontrolling interest	(390)	0
Net earnings attributable to Bel Fuse shareholders	$ 17,874	$ 15,874
Common Class A [Member]
Net earnings per common share:
Net earnings per common share - basic and diluted (in dollars per share)	$ 1.36	$ 1.19
Weighted-average number of shares outstanding:
Weighted-average number of shares outstanding - basic and diluted (in shares)	2,115	2,139
Common Class B [Member]
Net earnings per common share:
Net earnings per common share - basic and diluted (in dollars per share)	$ 1.43	$ 1.26
Weighted-average number of shares outstanding:
Weighted-average number of shares outstanding - basic and diluted (in shares)	10,457	10,610