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Note 4 - Other Accrued Expenses and Liabilities - Summary of Accrued Expenses (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Accrued payroll and payroll related expenses $ 149,620 $ 182,708
Accrued professional fees 338,627 48,338
Accrued clinical studies expenses 9,100 57,378
Other accrued expenses 22,205 70,108
Total $ 519,552 $ 358,532