Investment in Joint Venture (Schedule of Financial Information for Joint Venture) (Details) (Fund VIII-IX Associates, USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Fund VIII-IX Associates
Schedule of Equity Method Investments [Line Items]
Total Revenues	$ 0	$ 185,551
Income (Loss) From Continuing Operations	(154,584)	85,063
Income From Discontinued Operations	2,113,298	82,654
Net Income	$ 1,958,714	$ 167,717