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Note 6 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 5,000,000   5,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,497,119   3,497,119  
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 $ 4,100   $ 4,100  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term     3 years 90 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 300 $ 1,700 $ 900 $ 2,300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 11,000   98,385 101,012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 10.98 $ 7.41 $ 6.43 $ 5.11
Proceeds from Stock Options Exercised $ 100 $ 700 $ 405 $ 798
Stock Issued During Period, Shares, New Issues 6,000 71,599 26,234 113,143
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 100 $ 200 $ 100 $ 200
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [1]     3 years 5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term     3 years 30 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 500   $ 500  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     48,515 43,988
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 6.06 $ 4.83
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised 0 68,698 12,125 128,062
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested   $ 800 $ 100 $ 1,500
Employee Service Share-based Compensation, Tax Benefit from Exercise of Equity Instruments Other than Options   $ 300 $ 100 $ 600
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     $ 23.56  
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, Total $ 1,100   $ 1,100  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 302 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     $ 25.05  
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, Total $ 2,900   $ 2,900  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 65 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 1,031 27,341 6,894 43,841
Stock Issued During Period, Shares, New Issues 6,000 71,599 26,234 113,143
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.