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Note 6 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award Options Vested and Expected to Vest Exercisable Intrinsic Value $ 7,418,000   $ 7,418,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 1,677,000 $ 595,000 $ 2,289,000 $ 1,196,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 11,000 11,000 101,012 120,332
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 7.41 $ 7.38 $ 5.11 $ 4.75
Proceeds from Stock Options Exercised $ 693,000 $ 459,000 $ 798,000 $ 781,000
Company Stock Received in Lieu of Cash Stock Options Exercised 27,341 10,434 43,841 10,434
Stock Issued During Period, Shares, New Issues 71,599 30,416 113,143 30,416
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 196,000 $ 165,000 $ 209,000 $ 190,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term     3 years 210 days  
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 3,766,362   3,766,362  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     5 years  
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 2,191,000   $ 2,191,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term     2 years 210 days  
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 68,698 39,584 128,062 75,792
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 806,000 $ 485,000 $ 1,544,000 $ 928,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Equity Instruments Other than Options 302,000 $ 146,000 $ 572,000 $ 311,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [1]     5 years  
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  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 73 days  
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 704,000   $ 704,000  
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  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 292 days  
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 $ 1,838,000   $ 1,838,000  
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.