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 |
| X | ||||||||||
- Definition The pro forma net Income or Loss attributable to noncontrolling interests for the period as if the business combination or combinations had been completed at the beginning of a period. No definition available.
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| X | ||||||||||
- Definition The pro forma net Income or Loss including noncontrolling interests for the period as if the business combination or combinations had been completed at the beginning of a period. No definition available.
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| X | ||||||||||
- Definition Per basic share amount, after tax, of pro forma income (loss) of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Per diluted share amount, after tax, of pro forma income (loss) of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount, after tax, of pro forma income (loss) of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of pro forma revenue of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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