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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 408,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 146 days  
Share-based Payment Arrangement, Expense $ 50,000 $ 47,000
Share-based Payment Arrangement, Expense, Tax Benefit 3,000 5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 251,000 351,000
Proceeds from Stock Options Exercised 76,000 82,000
Share-based Payment Arrangement, Exercise of Option, Tax Benefit $ 0 $ 65,000
Stock Option Plan 2001 [Member]    
Common Stock, Capital Shares Reserved for Future Issuance 0  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 0  
Stock Option Plan 2013 [Member]    
Common Stock, Capital Shares Reserved for Future Issuance 425,400  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 236,100  
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, Options, Grants in Period, Gross 0 76,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 197,000 $ 84,000
Stock Option Plan 2013 [Member] | Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years