Basic and Diluted Earnings (Loss) per Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator:
Net income (loss) (in dollars)	$ (213,745)	$ 102,577	$ (18,944)	$ 634,961
Denominator:
Denominator for basic earnings (loss) per share—weighted average shares	12,616,000	12,507,000	12,617,000	12,499,000
Dilutive effect of employee stock options and other warrants	92,000	171,000	90,000	159,000
Denominator for diluted earnings (loss) per share—adjusted weighted average shares	12,708,000	12,678,000	12,707,000	12,658,000
Basic earnings (loss) per share (in dollars per share)	$ (0.02)	$ 0.01	$ 0.00	$ 0.05
Diluted earnings (loss) per share (in dollars per share)	$ (0.02)	$ 0.01	$ 0.00	$ 0.05