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Note 1 - Description of Business and Summary of Significant Accounting Policies - Basic and Diluted Net Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net earnings attributable to Bel shareholders | $ 40,960 | $ 73,831 | $ 52,689
Undistributed earnings | 37,521 | 70,322 | 49,253
Common Class A [Member] |  |  |
Net earnings attributable to Bel shareholders | 6,572 | 11,830 | 8,598
Less dividends declared | 508 | 512 | 514
Undistributed earnings | $ 6,064 | $ 11,318 | $ 8,084
Weighted-average number of shares outstanding - basic and diluted (in shares) | 2,124 | 2,142 | 2,143
Net earnings per share, basic and diluted (in dollars per share) | $ 3.1 | $ 5.52 | $ 4.01
Common Class B [Member] |  |  |
Net earnings attributable to Bel shareholders | $ 34,388 | $ 62,001 | $ 44,091
Less dividends declared | 2,931 | 2,997 | 2,922
Undistributed earnings | $ 31,457 | $ 59,004 | $ 41,169
Weighted-average number of shares outstanding - basic and diluted (in shares) | 10,491 | 10,634 | 10,394
Net earnings per share, basic and diluted (in dollars per share) | $ 3.28 | $ 5.83 | $ 4.24

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