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Note 13 - Equity Incentive Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 18, 2019
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 13, 2017
Jun. 18, 2013
Jun. 07, 2011
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested and Expected to Vest Outstanding Weighted Average Exercise Price     $ 41.65          
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Ppreciation Rights Vested and Expected to Vest Outstanding Aggregate Intrinsic Value     $ 8,600          
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding, Weighted Average Remaining Contractual Term     5 years          
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercises in Period, Total Intrinsic Value     $ 8,500 $ 8,500 $ 500      
Shares Issued, Share, Share-based Payment Arrangement Non-Option Equity Instruments, Exercised     31,541          
Share-based Payment Arrangement, Expense     $ 6,087 $ 11,046 $ 5,807      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value     $ 14.73 $ 20.01 $ 16.87      
Share-based Payment Arrangement, Expense, Tax Benefit     $ 100 $ 1,500 $ 400      
Chief Executive Officer [Member]                
Share-based Payment Arrangement, Expense   $ 6,200            
Stock Options, SARs and Restricted Stock Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance     690,968          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 4,700          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years 109 days          
Stock Appreciation Rights (SARs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised     35,250        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance     0          
Restricted Stock and Restricted Stock Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested in Period Fair Value     $ 2,700 $ 6,700 2,100      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 1,400 $ 6,800 $ 2,300      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 33.64 $ 58.84 $ 52.03      
Performance Shares [Member]                
Share-based Compensation, Performance Shares Measured by Business Targets     30.00%          
Share-based Compensation, Performance Shares Measured by Financial Targets     70.00%          
Share-based Payment Arrangement, Expense     $ 1,200 $ 700 $ 800      
The 2017 Plan [Member]                
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs           2    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           1,200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 1,500,000              
Common Stock, Capital Shares Reserved for Future Issuance 2,700,000     1,200,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     1,700,000          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years          
The 2017 Plan [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     1 year          
The 2017 Plan [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years          
Amended Two Thousand Three Plan [Member]                
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs               1.9
Second Amended Two Thousand Three Plan [Member]                
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs             1.5