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Note 6 - Share-based Compensation - Components of Share-based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restricted Stock Units (RSUs) [Member] |  |  |
Pretax compensation expense | $ 44,505 | $ 47,044 | $ 38,632
Tax benefit | 10,637 | 11,300 | 9,337
Share unit expense, net of tax | 12,937 | 10,374 | 11,141
Performance Shares [Member] |  |  |
Pretax compensation expense | 17,000 | 13,654 | 14,692
Tax benefit | $ 4,063 | $ 3,280 | $ 3,551

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