Note 3 - Earnings (Loss) Per Share - Computation of Diluted Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Basic EPS, Income (loss) numerator	$ 3,687,965	$ 2,967,218
Weighted Average Number of Shares Outstanding, Basic, Total	150,832,451	147,865,246
Basic EPS, Per-share amount (in dollars per share)	$ 0.02	$ 0.02
Effect of dilutive securities, Income (loss) numerator	$ (280,117)	$ 4,766
Effect of dilutive securities, Shares denominator (in shares)	13,786,417	312,738
Effect of dilutive securities, Per-share amount (in dollars per share)	$ (0.02)	$ 0
Diluted EPS, Income (loss) numerator	$ 3,407,848	$ 2,971,984
Diluted EPS, Shares denominator (in shares)	164,618,868	148,177,984
Diluted EPS, Per-share amount (in dollars per share)	$ 0.02	$ 0.02