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Note 6 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Proceeds from Stock Options Exercised $ 0  
Benefit (Shortfall) of Tax Deductions from Share-based Compensation $ 37 $ 300
2005 Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 2,060,019  
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 1,500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 7,200 $ 7,700
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 8 months 12 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%  
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%