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Note 5 - Prepaid Expenses - Schedule of Prepaid Expenses (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Prepaid insurance $ 160,576 $ 125,056
Prepaid research and development 218,090
Professional services 110,094 97,788
Retainer and security deposits 16,718 14,218
Other 4,355 13,882
Total prepaid expenses $ 509,833 $ 250,944