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Note 4 - Prepaid Expenses - Schedule of Prepaid Expenses (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Prepaid insurance $ 201,234 $ 160,576
Prepaid research and development 446,143 218,090
Professional services 117,748 110,094
Financial exchange fees 21,000
Prepaid rent 12,825
Retainer and security deposits 14,218 16,718
Other 4,355
Total prepaid expenses $ 813,168 $ 509,833