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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 129 Months Ended
Jan. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Share-based Payment Arrangement, Expense   $ 1,200,000 $ 1,100,000 $ 6,500,000 $ 5,700,000  
Share-based Payment Arrangement, Expense, Tax Benefit   $ 200,000 $ 200,000 $ 1,500,000 $ 1,200,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           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   0 0 263,574 280,590  
Performance-based Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   8,260   66,130    
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   $ 8,300,000   $ 8,300,000   $ 8,300,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition       2 years 9 months 18 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   700,000 $ 200,000 $ 6,900,000 $ 7,000,000.0  
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   200,000 $ 100,000 100,000 200,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 1,000   $ 23,000 $ 2,000