Discontinued Operations (Details Textual) (USD $)	3 Months Ended		9 Months Ended			12 Months Ended				9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2012 Segment, Discontinued Operations [Member] Office Building [Member]	Dec. 31, 2012 Segment, Discontinued Operations [Member] Single Tenant Property [Member]	Dec. 31, 2012 Segment, Discontinued Operations [Member] Shopping Center Property [Member]	Dec. 31, 2012 Segment, Discontinued Operations [Member] Shopping Center Property One [Member]	Sep. 30, 2013 Segment, Discontinued Operations [Member] Ypsilanti Property [Member]
Proceeds from Sale of Property, Plant, and Equipment						$ 650,000	$ 4,460,000	$ 3,500,000	$ 7,475,000	$ 5,600,000
Long-term Debt, Gross					9,200,000
Disposal Group, Including Discontinued Operation, Revenue	0	390,543	9,301	2,116,663
Disposal Group, Including Discontinued Operation, Operating Expense	0	180,924	2,287	1,009,303
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest	$ 0	$ (3,266)	$ 24,732	$ 85,296