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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restricted Stock Units (RSUs) [Member] |  |  |
Pretax compensation expense | $ 38,632 | $ 32,797 | $ 28,679
Tax benefit | 9,337 | 7,740 | (4,385)
Share unit expense, net of tax | 29,295 | 25,057 | 33,064
Performance Shares [Member] |  |  |
Pretax compensation expense | 14,692 | 14,572 | 9,612
Tax benefit | 3,551 | 3,439 | (1,470)
Share unit expense, net of tax | $ 11,141 | $ 11,133 | $ 11,082

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