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Note 6 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
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 3,507,469    
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 $ 7,800    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 120 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 600 $ 600  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 87,385 90,012  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 6.06 $ 4.83  
Proceeds from Stock Options Exercised $ 257 $ 105  
Stock Issued During Period, Shares, New Issues 20,234 41,544  
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 100 $ 100  
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 120 days    
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 1,300    
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 12,125 59,364  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 100 $ 700  
Employee Service Share-based Compensation, Tax Benefit from Exercise of Equity Instruments Other than Options $ 100 $ 200  
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 $ 1,200    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 29 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 $ 26.99    
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 $ 1,500    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years    
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 5,863 16,500  
Stock Issued During Period, Shares, New Issues 20,234 41,544  
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.