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Note 4 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Accrued payroll and payroll related expenses $ 510,002 $ 653,899
Accrued professional fees 77,258 31,809
Accrued clinical studies expenses 406,439 1,055,398
Other accrued expenses 55,205 35,364
Total $ 1,048,904 $ 1,776,470