Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Basic net income (loss) per share:
Net income (loss) applicable to common shares	$ 345	$ 793	$ 134	$ 175	$ (1,906)	$ 1,545	$ 395	$ 310	$ 1,447	$ 344	$ (23,572)
Weighted average common shares outstanding									11,180	12,038	12,195
Basic net income (loss) per share of common stock	$ 0.03	$ 0.07	$ 0.01	$ 0.02	$ (0.17)	$ 0.13	$ 0.03	$ 0.03	$ 0.13	$ 0.03	$ (1.93)
Diluted net income (loss) per share:
Net income (loss) applicable to common shares	$ 345	$ 793	$ 134	$ 175	$ (1,906)	$ 1,545	$ 395	$ 310	$ 1,447	$ 344	$ (23,572)
Weighted average common shares outstanding									11,180	12,038	12,195
Weighted average common shares, assuming dilutive effect of stock options									11,589	12,048	12,195
Diluted net income (loss) per share of common stock	$ 0.03	$ 0.07	$ 0.01	$ 0.02	$ (0.17)	$ 0.13	$ 0.03	$ 0.03	$ 0.13	$ 0.03	$ (1.93)
Stock option [Member]
Diluted net income (loss) per share:
Dilutive effects of stock options									409	10