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Note 12 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 5,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,667,577    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 5 years    
Share-based Compensation Arrangement by Share-based Payment Award Options Vested and Expected to Vest Exercisable Intrinsic Value $ 8,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 300 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 4,200 $ 3,100 $ 3,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 155,142 172,862 153,618
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 5.56 $ 4.69 $ 5.22
Proceeds from Stock Options Exercised $ 1,872 $ 1,504 $ 1,840
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 800 400 600
Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [1] 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2 years 330 days    
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 1,300 500 1,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding 1,400    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 3,500 $ 1,500 $ 2,600
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 4.83 $ 4.49 $ 5.20
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 18.30 $ 16.35  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 700    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 3 days    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 18.39    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 1,600    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 91 days    
Performance Shares [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Performance Shares [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Common Stock [Member]      
Shares Received from Stock Options Exercised 50,981 27,770 14,571
Stock Issued During Period, Shares, New Issues 144,443 81,608 50,224
Outside Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years    
[1] The expected life in years for awards granted was based on the historical exercise patterns experienced by the Company when the award is made.