Note 2 - Basic and Diluted Earnings (Loss) Per Share - Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net loss	$ (319,103)	$ 134,478	$ (314,975)	$ (897,346)
Denominator for basic earnings (loss) per share--weighted average shares (in shares)	1,845,000	1,846,000	1,845,000	1,846,000
Dilutive effect of employee stock options and other warrants (in shares)
Denominator for diluted earnings (loss) per share--adjusted weighted average shares (in shares)	1,845,000	1,846,000	1,845,000	1,846,000
Basic earnings (loss) per share (in dollars per share)	$ (0.17)	$ 0.07	$ (0.17)	$ (0.49)
Diluted earnings (loss) per share (in dollars per share)	$ (0.17)	$ 0.07	$ (0.17)	$ (0.49)