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Note 10 - Stockholders' Equity and Stock Incentive Plans - Share-based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based compensation expense $ 37,773 $ 9,202 $ 25,202
Share-based Payment Arrangement, Option [Member]      
Share-based compensation expense 0 0 52
Restricted Stock Units (RSUs) [Member]      
Share-based compensation expense 21,599 11,131 14,301
Performance Shares [Member]      
Share-based compensation expense 14,883 (3,166) 9,525
Career Shares [Member]      
Share-based compensation expense $ 1,291 $ 1,237 $ 1,324