Note 5 - Prepaid Expenses - Schedule of Prepaid Expenses (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Prepaid research and development	$ 1,742,363	$ 1,215,834
Prepaid insurance	554,405	417,854
Professional services	172,955	128,229
Financial exchange fees	43,500
Retainer and security deposits	14,218	14,218
Prepaid rent	18,720	4,488
Other	4,291	33,279
Total prepaid expenses	$ 2,550,452	$ 1,813,902