Nature of Operations (Details Textuals) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Mar. 30, 2012 Silicon Valley Bank credit facility
Line of Credit Facility [Line Items]
Working Capital	$ 25,500,000
Cash and cash equivalents	15,851,417	13,856,893	27,151,258	10,955,403
Increase in credit facility					$ 15,000,000