Computation of Basic and Diluted Net Income Per Share (Details) (USD $)	0 Months Ended		3 Months Ended			9 Months Ended
	Jun. 07, 2012	Sep. 17, 2010	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Basic Shares:
Weighted average common shares outstanding (in shares)			8,900,574	9,232,603		8,874,252	9,228,355
Weighted average common shares repurchased (in shares)			0	(379,809)		0	(185,039)
Basic shares (in shares)			8,900,574	8,852,794		8,874,252	9,043,316
Dilutive Shares:
Weighted average dilutive securities (in shares)			1,685,638	1,245,146		1,435,481	215,149
Dilutive Shares (in shares)			10,586,212	10,097,940		10,309,733	9,258,465
Anti-dilutive potential shares of common stock			1,100,000	1,500,000		1,300,000	2,500,000
Authorized amount of stock repurchase, minimum	$ 2,000,000				$ 1,500,000
Stock repurchased (in shares)							379,811
Stock repurchased aggregate price						$ 0	$ 1,453,000
Average price paid for shares repurchased (in dollars per share)							$ 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%	1.10%	0.50%		0.80%	0.60%
Stock price volatility		77.50%	56.00%	81.00%		65.00%	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