Note 6 - Net (Loss) Per Share - Earnings Per Share Reconciliation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Numerator for basic and diluted (loss) per share, net (loss) available to common shareholders	$ (936,017)	$ (1,239,034)	$ (3,059,195)	$ (3,587,534)
Denominator:
Denominator for basic (loss) per share, weighted average shares outstanding (in shares)	15,474,171	13,054,962	13,924,803	12,906,206
Effect of dilutive securities (in shares)
Denominator for diluted earnings per share, adjust weighted average shares and assumed conversion (in shares)	15,474,171	13,054,962	13,924,803	12,906,206
Basic (loss) per common share (in dollars per share)	$ (0.06)	$ (0.09)	$ (0.22)	$ (0.28)
Diluted (loss) per common share and common share equivalent (in dollars per share)	$ (0.06)	$ (0.09)	$ (0.22)	$ (0.28)