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Note 5 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 18 Months Ended
Jun. 06, 2018
Feb. 21, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     $ 155,000 $ 199,000 $ 356,000 $ 336,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 10,344            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 31.20            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         1,000,000 391,000  
Proceeds from Stock Options Exercised         $ 965,000 $ 487,000  
Shares Paid for Exercise Price and Tax Withholding for Share Based Compensation         0 6,511  
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, Total     $ 1,300,000   $ 1,300,000   $ 1,300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         3 years 292 days    
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