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Note 5 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended
Feb. 21, 2016
Mar. 31, 2018
Mar. 31, 2017
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 155,000 $ 137,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   514,000 184,000
Proceeds from Stock Options Exercised   $ 368,000 $ 79,000
Shares Paid for Exercise Price and Tax Withholding for Share Based Compensation   0 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 1,500,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   4 years  
Restricted Stock Units (RSUs) [Member]      
Shares Paid for Tax Withholding for Share Based Compensation   5,238 4,377
Shares Paid for Tax Withholding for Share Based Compensation Market Price   $ 27.60 $ 24.50
The 2003 Incentive Plan [Member] | Chairman Chief Executive Officer and President [Member] | Common Stock [Member]      
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures, Total $ 400,000