Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basic and Diluted Net Income (Loss) Per Share
Net income (loss)	$ 438	$ 4,282	$ (331)	$ 2,418
Weighted average shares outstanding	8,858	8,874	8,829	8,860
Weighted effect of dilutive options and rights	97	54		76
Weighted average shares outstanding assuming dilution	8,955	8,928	8,829	8,936
Net income (loss) per share:
Basic	$ 0.05	$ 0.48	$ (0.04)	$ 0.27
Diluted	$ 0.05	$ 0.48	$ (0.04)	$ 0.27