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Note 5 - Debt (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Notes Tables |
Interest Expense Disclosure [Table Text Block] |
|  | 2021 |  |  | 2020 |
GRA Note |  | $ | 633 |  |  | $ | 1,727 |
PPP Loan |  |  | 653 |  |  |  | 1,203 |
Insurance premium financing costs |  |  | - |  |  |  | 1,743 |
Convertible debentures (including $124,185 of debt discount amortization) |  |  | - |  |  |  | 138,851 |
Total interest expense |  | $ | 1,286 |  |  | $ | 143,524 |

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