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Note 5 - Share-based Compensation - Components of Share-based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Restricted Stock Units (RSUs) [Member] |  |  |
Pretax compensation expense | $ 49,172 | $ 56,837 | $ 54,276
Tax benefit | 12,214 | 12,561 | 13,216
Restricted share units, net of tax | 36,958 | 44,276 | 41,060
Performance Shares [Member] |  |  |
Pretax compensation expense | 16,514 | 22,352 | 23,259
Tax benefit | 4,102 | 4,940 | 5,664
Restricted share units, net of tax | $ 12,412 | $ 17,412 | $ 17,595

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