Note 2 - Liquidity and Capital Resources (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Net Income (Loss) Attributable to Parent, Total	$ (3,538,069)	$ (2,947,420)
Net Cash Provided by (Used in) Operating Activities, Total	(4,408,788)	(3,229,995)
Cash and Cash Equivalents, at Carrying Value, Ending Balance	137,573,593	$ 9,351,141	$ 39,553,671
Working Capital	139,652,000
Proceeds from Issuance or Sale of Equity, Total	$ 102,429,000