Stock Based Compensation (Details 1) (USD $)	6 Months Ended
	Jun. 30, 2013
Range One [Member]
Stock options outstanding
Number Outstanding	72,275
Exercise Prices, Lower Range	$ 3.50
Exercise Prices, Higher Range	$ 4.00
Range Two [Member]
Stock options outstanding
Number Outstanding	72,069
Exercise Prices, Lower Range	$ 4.01
Exercise Prices, Higher Range	$ 4.95
Range Three [Member]
Stock options outstanding
Number Outstanding	36,091
Exercise Prices, Lower Range	$ 4.96
Exercise Prices, Higher Range	$ 12.95
Range Four [Member]
Stock options outstanding
Number Outstanding	40,049
Exercise Prices, Lower Range	$ 12.96
Exercise Prices, Higher Range	$ 23.20
Range Five [Member]
Stock options outstanding
Number Outstanding	31,602
Exercise Prices, Lower Range	$ 23.21
Exercise Prices, Higher Range	$ 30.70