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Note 11 - Stock Option and Equity Incentive Plans (Details Textual) - USD ($)
12 Months Ended
Jun. 06, 2017
Feb. 21, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures     $ 1,068,000 $ 1,056,000 $ 1,069,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     $ 0 $ 145,000 356,000
Employee and Nonemployee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     202,379 232,578  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     27,336    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 600,000 $ 700,000 1,300,000
Proceeds from Stock Options Exercised     $ 800,000 $ 700,000 $ 400,000
Shares Paid for Exercise Price and Tax Withholding for Share Based Compensation     6,511 6,514 1,632
Shares Paid for Exercise Price of Awards     6,511 6,514 1,632
Shares Paid for Tax Withholding for Share Based Compensation     0 0 0
Shares Paid for Exercise Price and Tax Withholding for Share-based Compensation, Average Market Price     $ 26.45 $ 25.50 $ 21.97
Restricted Stock Units (RSUs) [Member]          
Shares Paid for Tax Withholding for Share Based Compensation     4,377 3,389 3,405
Shares Paid for Tax Withholding for Share Based Compensation Market Price     $ 24.50 $ 22.82 $ 23.15
The 2003 Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     2,250,000    
Limit on Tax Deductible Compensation     $ 1,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued, Accumulative     1,213,764    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     56,902    
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     94,375    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     893,615    
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   $ 400,000      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 12,336        
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     3,882    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     115,336    
Nonemployee Director Stock Incentive Plan [Member] | Employee and Nonemployee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     129,879    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     338,146