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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Restricted Stock Units (RSUs) [Member] |  |  |
Pretax compensation expense | $ 56,837 | $ 54,276 | $ 44,505
Tax benefit | 12,561 | 13,216 | 10,637
Restricted share units, net of tax | 44,276 | 41,060 | 33,868
Performance Shares [Member] |  |  |
Pretax compensation expense | 22,352 | 23,259 | 17,000
Tax benefit | 4,940 | 5,664 | 4,063
Restricted share units, net of tax | $ 17,412 | $ 17,595 | $ 12,937

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