Schedule III - Real Estate and Accumulated Depreciation (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Balance at January 1	$ 398,811,830	$ 340,073,911	$ 339,492,832
Construction and acquisition cost	82,692,554	97,418,031	31,219,239
Impairment charge	(450,000)	0	(13,500,000)
Disposition of real estate	(4,885,560)	(38,680,112)	(17,138,160)
Balance at December 31	$ 476,168,824	$ 398,811,830	$ 340,073,911