Note 5 - Prepaid Expenses - Schedule of Prepaid Expenses (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Prepaid research and development	$ 1,689,936	$ 1,215,834
Prepaid insurance	522,178	417,854
Professional services	122,594	128,229
Financial exchange fees	29,000	0
Retainer and security deposits	14,218	14,218
Prepaid rent	14,040	4,488
Other	0	33,279
Total prepaid expenses	$ 2,391,966	$ 1,813,902