Basic and Diluted Earnings per Share (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net income (in dollars)	$ 194,801	$ 532,384
Denominator:
Denominator for basic earnings per share--weighted average shares	12,620,000	12,512,000
Dilutive effect of employee stock options and other warrants	88,000	121,000
Denominator for diluted earnings per share--adjusted weighted average shares	12,708,000	12,633,000
Basic earnings per share (in dollars per share)	$ 0.02	$ 0.04
Diluted earnings per share (in dollars per share)	$ 0.02	$ 0.04