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Note 9 - Stock Based Compensation (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 0
Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years  
Share-based Payment Arrangement, Option [Member] | Director [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year  
Share-based Payment Arrangement, Option [Member] | Minimum [Member] | Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years  
Share-based Payment Arrangement, Option [Member] | Maximum [Member] | Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 30,354 182,732
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 207,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 182 days  
A 2012 Incentive Compensation Plan [Member] | Common Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,600,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,200,000