Note 7 - Loss Per Share - Shares Used in Basic and Diluted Loss Per Common Share Computations (Details) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Net loss		$ (10,086,477)	$ (6,003,017)
Weighted average common shares outstanding-basic (in shares)		12,816,289	6,362,989
Effect of dilutive stock options warrants and preferred stock (1) (in shares)	[1]
Weighted average common shares outstanding-diluted (in shares)		12,816,289	6,362,989
Loss per common share - basic and diluted (in dollars per share)		$ (0.79)	$ (0.94)

[1] The number of shares underlying options and warrants outstanding as of December 31, 2018 and December 31, 2017 are 7,295,921 and 4,716,240, respectively. The number of shares underlying the preferred stock as of December 31, 2018 is 79,246 for Series B Convertible. The number of shares underlying the convertible debt is 3,294,087. The effect of the shares that would be issued upon exercise of such options, warrants, convertible debt and preferred stock has been excluded from the calculation of diluted loss per share because those shares are anti-dilutive.