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Note 6 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Proceeds from Stock Options Exercised     $ 0  
Benefit (Shortfall) of Tax Deductions from Share-based Compensation     $ 17,000 $ 400
2005 Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 2,055,147   2,055,147  
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years  
Share-based Payment Arrangement, Expense $ 1,200 $ 1,000 $ 2,500 2,500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 7,800 $ 6,100 $ 7,800 $ 6,100
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 6 months  
Performance-based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years  
Performance-based Restricted Stock Units [Member] | Minimum [Member] | Share-based Payment Arrangement, Tranche One [Member]        
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target 0.00%   0.00%  
Performance-based Restricted Stock Units [Member] | Maximum [Member] | Share-based Payment Arrangement, Tranche One [Member]        
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target 150.00%   150.00%