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Note 18 - Equity Incentive Plans (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Proceeds from Stock Options Exercised $ 0 $ 0 $ 838
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)     35,880
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   0  
Share-based Payment Arrangement, Expense 5,600    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 8,400 9,300  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 10 months 24 days    
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   $ 6,600 $ 7,300
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%    
2005 Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 2,045,451