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Note 3 - Acquisition and Divestiture - Schedule of Pro Forma Information (Details) - Enercon Technologies, Ltd [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Revenue, net | $ 632,130 | $ 735,522
Net earnings | 56,154 | 56,448
Less: Net earnings attributable to non-controlling interest | 4,131 | 1,176
Net earnings attributable to Bel Fuse | $ 52,023 | $ 55,272
Common Class A [Member] |  |
Earnings per common share - basic and diluted (in dollars per share) | $ 3.94 | $ 4.13
Common Class B [Member] |  |
Earnings per common share - basic and diluted (in dollars per share) | $ 4.16 | $ 4.37

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