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Note 12 - Stock Option and Equity Incentive Plans (Details Textual) - USD ($)
12 Months Ended
Jun. 06, 2018
Feb. 21, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 08, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     101,626      
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures, Total     $ 1,212,000 $ 1,068,000 $ 1,056,000  
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     $ 167,000   145,000  
Employee and Nonemployee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance     134,403 202,739    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     10,344      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 1,200,000 $ 600,000 700,000  
Proceeds from Stock Options Exercised     $ 1,300,000 $ 800,000 $ 700,000  
Shares Paid for Exercise Price and Tax Withholding for Share Based Compensation       6,511 6,514  
Shares Paid for Exercise Price of Awards       6,511 6,514  
Shares Paid for Tax Withholding for Share Based Compensation       0 0  
Shares Paid for Exercise Price and Tax Withholding for Share-based Compensation, Average Market Price       $ 26.45 $ 25.50  
Restricted Stock Units (RSUs) [Member]            
Shares Paid for Tax Withholding for Share Based Compensation     5,238 4,377 3,389  
Shares Paid for Tax Withholding for Share Based Compensation Market Price     $ 27.60 $ 24.50 $ 22.82  
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     $ 0 $ 0 $ 145,000  
The 2003 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           2,250,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued, Accumulative     1,236,812      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     73,392      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants     185,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance     49,375      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     854,077      
The 2003 Incentive Plan [Member] | Common Stock [Member] | Chairman Chief Executive Officer and President [Member]            
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures, Total   $ 400,000        
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 3,366          
Nonemployee Director Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     975,000      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued, Accumulative     3,366      
Nonemployee Director Stock Incentive Plan [Member] | Employee and Nonemployee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance     106,543      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     348,490