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Note 3 - Acquisition - Schedule of Pro Forma Information (Details) - Enercon Technologies, Ltd [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024
Revenue, net	$ 153,741	$ 475,227
Net earnings	10,589	49,947
Less: Net earnings attributable to non-controlling interest	1,158	3,405
Net earnings attributable to Bel Fuse shareholders	$ 9,431	$ 46,542
Common Class A [Member]
Earnings per common share - basic and diluted (in dollars per share)	$ 0.72	$ 3.52
Common Class B [Member]
Earnings per common share - basic and diluted (in dollars per share)	$ 0.76	$ 3.71

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