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Note 12 - Equity Incentive Plan (Details Textual) - USD ($)
12 Months Ended
Jun. 18, 2013
Jun. 07, 2011
Jun. 05, 2009
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 04, 2003
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       0.9      
Allocated Share-based Compensation Expense       $ 3,392,000 $ 2,225,000 $ 1,607,000  
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested and Expected to Vest Outstanding Number       903,076      
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested and Expected to Vest Outstanding Weighted Average Exercise Price       $ 24.92      
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Ppreciation Rights Vested and Expected to Vest Outstanding Aggregate Intrinsic Value       $ 21.70      
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding, Weighted Average Remaining ContractualTerm       6 years 292 days      
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested Aggregate Intrinsic Value       $ 16,700,000 11,600,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding, Intrinsic Value       22,300,000 15,200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercises in Period, Total Intrinsic Value       2,100,000 3,100,000    
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested in Period Fair Value       1,300,000 1,100,000    
Proceeds from Stock Options Exercised       $ 1,007,000 1,074,000 2,055,000  
Employee Stock Option [Member]              
Share-based Compensation Arrangement Evaluation of Expected Volatility Assumption to Historical Volatility Average Period       4 years      
Stock Options, SARs and Restricted Stock Awards [Member]              
Allocated Share-based Compensation Expense       $ 3,400,000 2,200,000 1,600,000  
Stock Options and SARs [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number       979,569      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized       $ 5,000,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       2 years 292 days      
Incentive Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number       144,316      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price       $ 10.22      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       4 years 255 days      
Non-qualified Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number       281,093      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price       $ 15.61      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       5 years 255 days      
Performance Shares [Member]              
Allocated Share-based Compensation Expense       $ 300,000 400,000 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number       7,065      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price       $ 39.69      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       8 years 36 days      
Stock Appreciation Rights (SARs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number       40,250      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price       $ 6.94      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       2 years 292 days      
Restricted Stock and Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value       $ 1,000,000 $ 1,200,000    
Amended Two Thousand Three Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,800,000   2,350,000       1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 650,000   850,000        
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs 1.5            
Second Amended Two Thousand Three Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   3,150,000          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   800,000          
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs   1.9          
Two Thousand Three Plan [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       1 year      
Two Thousand Three Plan [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years