Note 5 - Prepaid Expenses - Schedule of Prepaid Expenses (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Prepaid research and development	$ 712,387	$ 507,733
Prepaid insurance	280,098	222,476
Professional services	278,298	108,850
Financial exchange fees	32,250
Retainer and security deposits	14,218	14,218
Prepaid rent	17,952	4,275
Other	1,917	4,792
Total prepaid expenses	$ 1,337,120	$ 862,344