Statements of Shareholders' Equity (USD $) In Thousands, except Share data	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Total
Balance at Dec. 31, 2009	$ 50	$ 7	$ 49,283	$ (2,681)	$ 46,659
Balance, shares at Dec. 31, 2009	10,000	7,205,701
Exercise of stock options			3,045		3,045
Exercise of stock options, shares		313,832
Issuance of restricted common stock		124,560
Purchase and retirement of common stock			(5,824)		(5,824)
Purchase and retirement of common stock, shares		(200,643)
Stock-based compensation			3,105		3,105
Net income				4,174	4,174
Balance at Dec. 31, 2010	50	7	49,609	1,493	51,159
Balance, shares at Dec. 31, 2010	10,000	7,443,450
Exercise of stock options			733		733
Exercise of stock options, shares		74,168
Issuance of restricted common stock		114,180
Purchase and retirement of common stock			(17,647)		(17,647)
Purchase and retirement of common stock, shares		(646,875)
Stock-based compensation			2,007		2,007
Excess tax benefit from stock-based awards			501		501
Net income				4,564	4,564
Balance at Jun. 30, 2011	$ 50	$ 7	$ 35,203	$ 6,057	$ 41,317
Balance, shares at Jun. 30, 2011	10,000	6,984,923