Computation of Basic and Diluted Net Income Per Share (Details) (USD $)	0 Months Ended		3 Months Ended		6 Months Ended
	Jun. 07, 2012	Sep. 17, 2010	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basic Shares:
Weighted average common shares outstanding (in shares)			8,865,407	9,227,698	8,860,873	9,226,216
Weighted average common shares repurchased (in shares)			0	(167,218)	0	(86,584)
Basic shares (in shares)			8,865,407	9,060,480	8,860,873	9,139,632
Dilutive Shares:
Weighted average dilutive securities (in shares)			267,770	215,414	243,436	247,408
Dilutive Shares (in shares)			9,133,177	9,275,894	9,104,309	9,387,040
Anti-dilutive potential shares of common stock			2,500,000	2,600,000	2,500,000	2,600,000
Authorized amount of stock repurchase, minimum	$ 2,000,000			$ 1,500,000
Stock repurchased (in shares)				333,823		379,811
Stock repurchased aggregate price				$ 1,200,000	$ 0	$ 1,453,000
Average price paid for shares repurchased (in dollars per share)				$ 3.69		$ 3.83
Warrant [Abstract]
Warrant price (in dollars per share)		$ 3.15
Number of shares warrants give right to purchase (in shares)		400,000
Risk-free rate		2.30%	0.90%	0.60%	0.70%	0.60%
Stock price volatility		77.50%	64.00%	82.00%	70.00%	84.00%
Term		8 years 0 months 14 days	4 years 3 months 18 days	4 years 2 months 12 days	4 years 3 months 18 days	4 years 2 months 12 days
Exercise price of warrant (in dollars per share)		$ 4.65