Note 10 - Net Loss Per Share - Schedule of Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net loss	$ (17,239,777)	$ (11,404,934)
Deemed dividend attributable to preferred stock		(11,479,308)
Net loss attributable to common shareholders	$ (17,239,777)	$ (22,884,242)
Weighted average common shares outstanding used to compute net loss per share, basic and diluted (in shares)	8,496,964	4,157,746
Net loss per share of common stock, basic and diluted: (in dollars per share)	$ (2.03)	$ (5.50)