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Note 4 - Prepaid Expenses - Schedule of Prepaid Expenses (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Prepaid insurance $ 234,875 $ 160,576
Prepaid research and development 392,894 218,090
Professional services 96,250 110,094
Financial exchange fees 58,685
Prepaid rent 17,100
Retainer and security deposits 14,218 16,718
Other 21,446 4,355
Total prepaid expenses $ 835,468 $ 509,833