Note 5 - Earnings Per Share - Basic and Diluted Net Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2024 |
Mar. 31, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Net earnings | $ 26,861 | $ 18,806 | $ 44,735 | $ 34,680 | ||
| Undistributed earnings | 25,994 | 17,954 | 43,004 | 32,952 | ||
| Common Class A [Member] | ||||||
| Net earnings | 4,299 | 3,028 | 7,174 | 5,573 | ||
| Less dividends declared | 127 | $ 127 | 127 | $ 129 | 254 | 256 |
| Undistributed earnings | $ 4,172 | $ 2,901 | $ 6,920 | $ 5,317 | ||
| Class A - basic and diluted (in shares) | 2,115 | 2,124 | 2,115 | 2,131 | ||
| Net earnings per common share - basic and diluted (in dollars per share) | $ 2.03 | $ 1.43 | $ 3.39 | $ 2.61 | ||
| Common Class B [Member] | ||||||
| Net earnings | $ 22,562 | $ 15,778 | $ 37,561 | $ 29,107 | ||
| Less dividends declared | 740 | $ 737 | 725 | $ 747 | 1,477 | 1,472 |
| Undistributed earnings | $ 21,822 | $ 15,053 | $ 36,084 | $ 27,635 | ||
| Class A - basic and diluted (in shares) | 10,551 | 10,492 | 10,504 | 10,551 | ||
| Net earnings per common share - basic and diluted (in dollars per share) | $ 2.14 | $ 1.5 | $ 3.58 | $ 2.76 | ||
| X | ||||||||||
- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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- Details
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