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Note 3 - Share-based Compensation - Components of Share-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restricted Stock Units (RSUs) [Member]        
Pretax compensation expense $ 12,429 $ 10,892 $ 27,108 $ 20,634
Tax benefit 3,182 2,723 6,940 5,158
Share unit expense, net of tax 9,247 8,169 20,168 15,476
Performance Shares [Member]        
Pretax compensation expense 3,573 3,840 6,957 7,670
Tax benefit 915 960 1,781 1,917
Share unit expense, net of tax $ 2,658 $ 2,880 $ 5,176 $ 5,753