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Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Debt Securities, Held-to-Maturity [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Fair Value |
Held to maturity U.S. Treasury securities |  | $ | 37,548 |  |  | $ | 103 |  |  | $ | 37,651 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Years Ended December 31, |
|  | 2023 |  |  | 2022 |
Numerator: |  |  |  |  |  |  |  |
Net earnings |  | $ | 73,831 |  |  | $ | 52,689 |
Less dividends declared: |  |  |  |  |  |  |  |
Class A |  |  | 512 |  |  |  | 514 |
Class B |  |  | 2,997 |  |  |  | 2,922 |
Undistributed earnings |  | $ | 70,322 |  |  | $ | 49,253 |
Undistributed earnings allocation: |  |  |  |  |  |  |  |
Class A undistributed earnings |  | $ | 11,318 |  |  | $ | 8,084 |
Class B undistributed earnings |  |  | 59,004 |  |  |  | 41,169 |
Total undistributed earnings |  | $ | 70,322 |  |  | $ | 49,253 |
Net earnings allocation: |  |  |  |  |  |  |  |
Class A net earnings |  | $ | 11,830 |  |  | $ | 8,598 |
Class B net earnings |  |  | 62,001 |  |  |  | 44,091 |
Net earnings |  | $ | 73,831 |  |  | $ | 52,689 |
Denominator: |  |  |  |  |  |  |  |
Weighted average shares outstanding: |  |  |  |  |  |  |  |
Class A |  |  | 2,142 |  |  |  | 2,143 |
Class B |  |  | 10,634 |  |  |  | 10,394 |
Net earnings per share: |  |  |  |  |  |  |  |
Class A |  | $ | 5.52 |  |  | $ | 4.01 |
Class B |  | $ | 5.83 |  |  | $ | 4.24 |

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