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Note 16 - Compensation Plans (Details Textual)
1 Months Ended 12 Months Ended
Feb. 23, 2016
USD ($)
shares
Dec. 18, 2013
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 24.81 $ 24.81  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares     22,000 22,001  
Employee Stock Option [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 400,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     330 days    
Stock Appreciation Rights (SARs) [Member] | At Strike Price [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares   75,000      
Stock Appreciation Rights (SARs) [Member] | At Strike Price 1 [Member]          
Share Price | $ / shares   $ 18.45      
Stock Appreciation Rights (SARs) [Member] | At Strike Price 2 [Member]          
Share Price | $ / shares   22.13      
Stock Appreciation Rights (SARs) [Member] | At Strike Price 3 [Member]          
Share Price | $ / shares   26.56      
Stock Appreciation Rights (SARs) [Member] | At Strike Price 4 [member]          
Share Price | $ / shares   $ 31.87      
Stock Appreciation Rights (SARs) [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 300,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     330 days    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years      
Share Price | $ / shares     $ 43.50 $ 29.32 $ 19.29
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares   300,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 900,000      
Restricted Stock [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     1 year    
Restricted Stock [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Restricted Stock [Member] | Subsequent Event [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 5,500,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares 133,187        
Restricted Stock [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 5,300,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 120 days    
Bonus Plan [Member]          
Deferred Compensation Arrangement with Individual, Compensation Expense     $ 4,600,000 $ 4,800,000 $ 4,200,000
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term     9 years    
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term     10 years    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     4.50% 4.50%  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 1,800,000 $ 1,800,000 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 32.56 $ 24.69 $ 10.14
Deferred Compensation Arrangement Period for Benefits     10 years    
Deferred Compensation Arrangement with Individual, Compensation Expense     $ 100,000 $ 100,000 $ 400,000
Allocated Share-based Compensation Expense     4,700,000 $ 3,300,000 $ 1,300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 6,000,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 96 days    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Share Price | $ / shares     $ 43.50 $ 29.32 $ 19.29
Proceeds from Stock Options Exercised     $ 1,861,000 $ 26,000 $ 64,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options     $ 200,000 $ 200,000 $ 300,000
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options Number of Tranches Granted   4      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares     146,000 166,000 172,000