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Note 6 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 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 3,456,944   3,456,944  
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, Exercisable, Number 667,784   667,784  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance 43,245   43,245  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     1 year 306 days  
Share-based Compensation Arrangement by Share-based Payment Award Options Vested and Expected to Vest Exercisable Intrinsic Value $ 3,200   $ 3,200  
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, Options, Exercises in Period, Intrinsic Value $ 100 $ 400 $ 900 $ 2,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 43,245 53,970 141,630 155,142
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 4.39 $ 6.40 $ 5.93 $ 5.56
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 200   $ 200  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 211 days  
Proceeds from Stock Options Exercised 100 $ 400 $ 432 $ 1,218
Shares Received from Stock Options Exercised     400,000 1,200,000
Stock Issued During Period, Shares, New Issues     26,234 113,143
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 100 $ 100 $ 100 $ 300
Common Stock [Member]        
Shares Received from Stock Options Exercised 0 0 6,894 43,841
Stock Issued During Period, Shares, New Issues     26,234 113,143
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [1] 3 years 5 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 306 days  
Employee Stock Option [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [1]     3 years 5 years
Employee Stock Option [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [1]     10 years 10 years
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     2 years 300 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 200   $ 200  
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 0 12,125 128,062
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested     $ 100 $ 1,500
Employee Service Share-based Compensation, Tax Benefit from Exercise of Equity Instruments Other than Options     $ 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 $ 900   $ 900  
Performance Shares [Member]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 339 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 24.56  
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  
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  
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.