Note 9 - Net Loss Per Share - Schedule of Earnings Per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net loss attributable to common shareholders	$ (2,947,420)	$ (4,073,307)
Weighted average common shares outstanding used to compute net loss per share, basic and diluted (in shares)	9,130,984	6,565,514
Net loss per share of common stock, basic and diluted: (in dollars per share)	$ (0.32)	$ (0.62)