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Note 4 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 06, 2017
Feb. 21, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     $ 106,000 $ 67,000 $ 441,000 $ 264,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 12,336       12,336  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 27.05       $ 27.05  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 577,000 564,000
Proceeds from Stock Options Exercised         $ 802,000 $ 529,000
Shares Paid for Exercise Price and Tax Withholding for Share Based Compensation         6,511 0
Shares Paid for Exercise Price and Tax Withholding for Share-based Compensation, Average Market Price         $ 26.45  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 754,000   $ 754,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         3 years 182 days  
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