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Note 4 - Accrued Expenses and Other Current Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Other Current Liabilities [Table Text Block] |
|  | December 31, |
|  | 2021 |  |  | 2020 |
Accrued payroll and payroll related expenses |  | $ | 879,971 |  |  | $ | 653,899 |
Accrued professional fees |  |  | 247,704 |  |  |  | 31,809 |
Accrued clinical studies expenses |  |  | 786,579 |  |  |  | 1,055,398 |
Other |  |  | 65,935 |  |  |  | 35,364 |
Total |  | $ | 1,980,189 |  |  | $ | 1,776,470 |

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