Goodwill and Intangible Assets (Details Textual) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011 Envision [Member]	Jun. 30, 2012 Maximum [Member]	Jun. 30, 2012 Minimum [Member]
Goodwill and Intangibles Assets (Textual) [Abstract]
Goodwill related to the acquisition of assets from Envision					$ 200,000
Amortization of intangible assets basis over estimated useful lives						8 years	1 year
Decrease in the net book value of intangible assets	$ 745,000	$ 661,000	$ 1,490,000	$ 1,334,000