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Note 6 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Benefit (Shortfall) of Tax Deductions from Share-based Compensation     $ 0.4 $ 0.6
2005 Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 2,150,724   2,150,724  
Restricted Stock Units (RSUs) [Member]        
Share-based Payment Arrangement, Expense $ 1.3 $ 1.8 $ 3.8 4.8
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 8.0 $ 11.5 $ 8.0 $ 11.5
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 8 months 12 days  
Minimum [Member]        
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target 0.00%   0.00%  
Maximum [Member]        
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target 150.00%   150.00%