Stock-Based Compensation (Details) (Stock Options [Member], USD $)	9 Months Ended
	Sep. 30, 2013
Stock Options [Member]
Summary of all stock option plans / warrant activity
Number of Options/Warrants Outstanding, Beginning Balance	1,715,200
Number of Options/Warrants Outstanding, Granted	130,000
Number of Options/Warrants Outstanding, Cancelled or expired	(18,256)
Number of Options/Warrants Outstanding, Exercised	(182,361)
Number of Options/Warrants Outstanding, Ending Balance	1,644,583
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 5.04
Weighted Average Exercise Price, Granted	$ 6.12
Weighted Average Exercise Price, Expired	$ 5.57
Weighted Average Exercise Price, Exercised	$ 4.44
Weighted Average Exercise Price, Outstanding, Ending Balance	$ 5.18