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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 |

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