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Note 4 - Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | 2020 |  |  | 2019 |
Accrued salaries and directors' fees |  | $ | 279,696 |  |  | $ | 1,732,702 |
Other accrued expenses |  |  | 79,585 |  |  |  | 118,338 |
Total accrued expenses |  | $ | 359,281 |  |  | $ | 1,851,040 |

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