Note 6 - Net (Loss) Per Share - Earnings Per Share Reconciliation (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Numerator for basic and diluted (loss) per share, net (loss) available to common shareholders	$ (1,288,169)	$ (1,275,611)	$ (2,123,178)	$ (2,348,500)
Denominator:
Denominator for basic (loss) per share, weighted average shares outstanding (in shares)	13,173,009	13,041,799	13,150,119	12,831,828
Effect of dilutive securities (in shares)
Denominator for diluted earnings per share, adjust weighted average shares and assumed conversion (in shares)	13,173,009	13,041,799	13,150,119	12,831,828
Basic (loss) per common share (in dollars per share)	$ (0.10)	$ (0.10)	$ (0.16)	$ (0.18)
Diluted (loss) per common share and common share equivalent (in dollars per share)	$ (0.10)	$ (0.10)	$ (0.16)	$ (0.18)