Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Stock options
Number of shares of common stock authorized for issuance	442,750		442,750
Common stock reserved for future grants (in shares)	115,989		115,989
Proceeds from the exercise of stock			$ 44,730	$ 63,492
Employee Stock Option [Member]
Stock options
Outstanding options (in shares)	5,085		5,085		11,417
Compensation cost recognized	3,500	3,800	15,000	10,100
Unrecognized compensation cost	23,000		23,000
Period during which compensation cost is expected to be recognized			3 years
Proceeds from the exercise of stock			$ 45,000	$ 63,000
Employee Stock Option [Member] | Minimum [Member]
Stock options
Option price range(as a percent)			85.00%
Period over which options become exercisable			1 year
Employee Stock Option [Member] | Maximum [Member]
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
Restricted Stock [Member]
Stock options
Expiration period of options granted			3 years