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Note 6 - Stockholders' Equity (Details Textual) - USD ($)
12 Months Ended 36 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Apr. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 19,250 18,000   19,250  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 3,250 2,750      
Share-based Payment Arrangement, Expense $ 8,821 $ 13,634      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 12,000     $ 12,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 0      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     100,000   100,000
Stock Repurchased During Period, Shares 7,199   33,500 40,699  
Stock Repurchase Program, Number of Additional Shares Authorized to be Repurchased         33,500
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 92,801     92,801  
The 1995 Incentive Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 442,750     442,750  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 16,000     16,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 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 102,157     102,157  
The 2019 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 102,907     102,907  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 3,250