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Note 4 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended
Feb. 21, 2017
Mar. 31, 2017
Mar. 31, 2016
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 137,000 $ 57,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   184,000  
Proceeds from Stock Options Exercised   79,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 1,000,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   10,375 0
Shares Paid for Exercise Price and Tax Withholding for Share Based Compensation   0 0
Restricted Stock Units (RSUs) [Member]      
Shares Paid for Tax Withholding for Share Based Compensation   4,377 3,889
Shares Paid for Tax Withholding for Share Based Compensation Market Price   $ 24.50 $ 22.82
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 $ 400,000