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Note 6 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
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 3,659,877   3,659,877  
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 $ 7,438,000   $ 7,438,000  
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 $ 387,000 $ 301,000 $ 2,675,000 $ 1,876,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 53,970 52,530 155,142 172,862
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 6.40 $ 4.53 $ 5.56 $ 4.69
Proceeds from Stock Options Exercised $ 420,000 $ 327,000 $ 1,218,000 $ 1,109,000
Company Stock Received in Lieu of Cash Stock Options Exercised 0 2,164 43,841 12,598
Stock Issued During Period, Shares, New Issues 0 5,568 113,143 35,984
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 97,000 $ 60,000 $ 306,000 $ 250,000
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 120 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 2,327,000   $ 2,327,000  
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
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised 0 0 128,062 75,792
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested     $ 1,544,000 $ 928,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Equity Instruments Other than Options     $ 572,000 $ 311,000
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 $ 624,000   $ 624,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years  
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 $ 1,733,000   $ 1,733,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 73 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  
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.