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Note 4 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Tax Cuts and Jobs Act, Change In Alternative Minimum Tax, Income Tax Benefit $ 1,001,233    
Proceeds from Income Tax Refunds 500,616 $ 506,866 $ 500,000
Current Income Tax Expense (Benefit), Total 0 0  
Deferred Income Tax Expense (Benefit), Total 0 0  
Operating Loss Carryforwards, Total 27,300,000 19,700,000  
Unrecognized Tax Benefits, Ending Balance 0    
Ministry of Finance, India [Member]      
Foreign Income Tax Expense (Benefit), Continuing Operations, Total $ 31,000 $ 10,000