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Note 7 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options     $ 45,000 $ 0
Allocated Share-based Compensation Expense $ 43,000 $ 30,000 86,000 55,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 5,000 $ 3,000 10,000 6,000
Proceeds from Stock Options Exercised     164,000 89,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 531,000 $ 145,000
Stock Option Plan 2001 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares     0 0
Common Stock, Capital Shares Reserved for Future Issuance 60,093   60,093  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 0   0  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 0   $ 0  
Stock Option Plan 2013 [Member]        
Common Stock, Capital Shares Reserved for Future Issuance 474,400   474,400  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 298,400   298,400  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0 108,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 294,000   $ 294,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 73 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 161,000 $ 76,000
Stock Option Plan 2013 [Member] | Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share Based Payment Award, Holding Period of Previously Owned Stock to be Used As Payment to Exercise Stock Options     180 days  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years