Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Stock options
Number of shares of common stock authorized for issuance	442,750		442,750
Excess tax benefit from exercise of stock option	$ 0	$ 0	$ 0	$ 0
Total of Company's APIC pool			111,000		111,000
Proceeds from the exercise of stock			63,492	30,123
Stock Options
Stock options
Outstanding options (in shares)	14,751		14,751		21,362
Common stock reserved for future grants (in shares)	115,573		115,573
Compensation cost recognized	3,800	4,400	10,100	13,400
Unrecognized compensation cost	24,000		24,000
Period during which compensation cost is expected to be recognized			3 years
Proceeds from the exercise of stock			$ 63,000	$ 30,000
Stock Options | Minimum
Stock options
Option price range(as a percent)			85.00%
Period over which options become exercisable			1 year
Stock Options | Maximum
Stock options
Option price range(as a percent)			110.00%
Expiration period of options granted			7 years
Period over which options become exercisable			3 years