Note 2 - Basic and Diluted Earnings (Loss) Per Share - Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income (loss)	$ (977,954)	$ (519,665)	$ (1,216,259)	$ 4,128
Denominator for basic earnings (loss) per share – weighted average shares (in shares)	1,845,000	1,845,000	1,845,000	1,845,000
Dilutive effect of employee stock options and other warrants (in shares)				1,000
Denominator for diluted earnings (loss) per share – adjusted weighted average shares (in shares)	1,845,000	1,845,000	1,845,000	1,846,000
Basic earnings (loss) per share (in dollars per share)	$ (0.53)	$ (0.28)	$ (0.66)	$ 0
Diluted earnings (loss) per share (in dollars per share)	$ (0.53)	$ (0.28)	$ (0.66)	$ 0