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Note 6 - Stockholders' Equity (Details Textual) - USD ($)
12 Months Ended 48 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2020
Apr. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 17,500 19,250   17,500  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 10,000 3,250      
Share-based Payment Arrangement, Expense $ 22,000 $ 9,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 348,000     $ 348,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) 0 0      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)     100,000   100,000
Stock Repurchased During Period, Shares (in shares) 0 7,199 33,500 40,699  
Stock Repurchase Program, Number of Additional Shares Authorized to be Repurchased (in shares)         33,500
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) 92,801     92,801  
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 54,300 0      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 6.11        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years        
The 1995 Incentive Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 442,750     442,750  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 5,000     5,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares) 11,750        
The 1995 Incentive Stock Option Plan [Member] | Share-based Payment Arrangement, Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   102,157      
The 2019 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 47,107     47,107  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares) 750        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 13,250        
The 2019 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 54,300