Note 10 - Net Loss Per Share - Schedule of Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net loss attributable to common shareholders	$ (5,197,145)	$ (3,491,071)	$ (15,774,462)	$ (10,344,633)
Weighted average common shares outstanding used to compute net loss per share, basic and diluted (in shares)	126,537,544	10,162,770	113,689,961	9,496,222
Net loss per share of common stock, basic and diluted: (in dollars per share)	$ (0.04)	$ (0.34)	$ (0.14)	$ (1.09)