Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)
Balance at the beginning of the period at Dec. 31, 2010	$ 31,735	$ 9	$ 39,073	$ (7,347)
Common stock outstanding, beginning (in shares) at Dec. 31, 2010		8,929,439
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)		168,514
Exercise of stock options (in dollars)	746	0	746
Tax benefit - stock option exercise	66	0	66
Compensation cost associated with ASC Topic 718	187	0	187
Employee Stock Purchase Plan (in shares)		199
Employee stock purchase plan (in dollars)	1	0	1
Net income	6,929			6,929
Balance at end of the period at Dec. 31, 2011	39,664	9	40,073	(418)
Common stock outstanding, ending (in shares) at Dec. 31, 2011	9,098,152	9,098,152
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	159,869	159,869
Exercise of stock options (in dollars)	489	0	489
Stock Repurchased (in shares)		94,744
Stock Repurchased (in dollars)	(384)	0	384
Tax benefit - stock option exercise	10	0	10
Compensation cost associated with ASC Topic 718	241	0	241
Employee Stock Purchase Plan (in shares)		185
Employee stock purchase plan (in dollars)	1	0	1
Net income	26,647			26,647
Balance at end of the period at Dec. 31, 2012	$ 66,668	$ 9	$ 40,430	$ 26,229
Common stock outstanding, ending (in shares) at Dec. 31, 2012	9,098,152	9,163,462