Offering Costs (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Related Party Transaction [Line Items]
Deferred costs due to supervisors			$ 922,728
Offering costs (Textual) [Abstract]
External offering costs	3,052,936		2,140,059
Deferred costs	912,877	228,841
Additional offering costs	80,187	47,168
Supervisor [Member]
Related Party Transaction [Line Items]
Deferred costs due to supervisors	$ 297,983		$ 922,728