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Note 6 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
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 3,777,362  
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 $ 6,234,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 150 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 612,000 $ 601,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 90,012 109,332
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 4.83 $ 4.49
Proceeds from Stock Options Exercised $ 105,000 $ 322,000
Company Stock Received in Lieu of Cash Stock Options Exercised 16,500 0
Stock Issued During Period, Shares, New Issues 41,544 0
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 13,000 $ 25,000
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 180 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 2,027,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised 59,364 36,208
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 738,000 $ 442,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Equity Instruments Other than Options $ 210,000 $ 157,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 43,988 58,108
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
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 $ 16.97  
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 $ 770,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 146 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 $ 16.97  
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 $ 1,943,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 4 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  
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.