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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 126 Months Ended
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Share-based Payment Arrangement, Expense   $ 1,400,000 $ 1,200,000 $ 5,400,000 $ 4,600,000  
Share-based Payment Arrangement, Expense, Tax Benefit   $ 300,000 $ 300,000 $ 1,300,000 $ 1,000,000.0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   0       0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance   0   0   0
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     5,600 263,574 280,590  
Performance-based Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       57,870    
Omnibus Plan 2014 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years          
Omnibus Plan 2014 [Member] | Restricted Stock Units (RSUs) [Member]            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 10,000,000.0   $ 10,000,000.0   $ 10,000,000.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition       3 years 7 months 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   200,000 $ 28,000 $ 6,200,000 $ 6,700,000  
The 2019 Long-term Incentive Compensation Program [Member]            
PRSU Awards, Percentage of Target Award, Below Threshold-level Performance 0.00%          
PRSU Awards, Percentage of Target Award, Threshold-level Performance 50.00%          
PRSU Awards, Percentage of Target Award, Target-Level Performance 100.00%          
PRSU Awards, Percentage of Target Award, Maximum-Level Performance 150.00%          
Phantom Stock Plan [Member] | Phantom Share Units (PSUs) [Member]            
Share-based Payment Arrangement, Expense   100,000 $ (100,000) 100,000 (100,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 1,000   $ 22,000 $ 1,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period       1 year