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Note 5 - Prepaid Expenses - Schedule of Prepaid Expenses (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Prepaid research and development $ 507,733 $ 218,090
Prepaid insurance 222,476 160,576
Professional services 108,850 110,094
Retainer and security deposits 14,218 16,718
Prepaid rent 4,275
Other 4,792 4,355
Total prepaid expenses $ 862,344 $ 509,833