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Note 6 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Proceeds from Stock Options Exercised     $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 1,863,749   1,863,749  
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 $ 1,700 $ 1,300 $ 4,100 $ 3,800
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 10,300 $ 8,000 $ 10,300 $ 8,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 10 months 24 days  
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%