Note 2 - Liquidity and Capital Resources (Details Textual) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Net Income (Loss) Attributable to Parent, Total	$ (5,197,145)	$ (7,039,248)	$ (3,538,069)	$ (3,491,071)	$ (3,906,142)	$ (2,947,420)	$ (15,774,462)	$ (10,344,633)
Net Cash Provided by (Used in) Operating Activities, Total							(12,806,602)	(8,137,695)
Cash and Cash Equivalents, at Carrying Value, Ending Balance	140,040,955			$ 9,105,950			140,040,955	$ 9,105,950	$ 39,553,671
Working Capital (Deficit)	$ 141,311,063						141,311,063
Proceeds from Issuance or Sale of Equity, Total							$ 113,486,817