Note 3 - Earnings (Loss) Per Share - Computation of Diluted Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Basic EPS, Income (loss) numerator	$ 2,967,218	$ 101,880
Weighted Average Number of Shares Outstanding, Basic	147,865,246	145,868,227
Basic EPS, Per-share amount (in dollars per share)	$ 0.02	$ 0
Effect of dilutive securities, Income (loss) numerator	$ 4,766	$ 0
Effect of dilutive securities, Shares denominator (in shares)	312,738	294,200
Effect of dilutive securities, Per-share amount (in dollars per share)	$ 0	$ 0
Diluted EPS, Income (loss) numerator	$ 2,971,984	$ 101,880
Diluted EPS, Shares denominator (in shares)	148,177,984	146,162,427
Diluted EPS, Per-share amount (in dollars per share)	$ 0.02	$ 0