Discontinued Operations (Details Textual) (USD $)	12 Months Ended				1 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009 sqft	Dec. 31, 2010 Louisiana [Member]	Aug. 31, 2011 Knoxville [Member]	Dec. 31, 2010 Knoxville [Member]	Dec. 31, 2010 Georgia [Member]	Dec. 31, 2011 Missouri [Member]	Sep. 30, 2012 Indiana [Member]	Dec. 31, 2012 Memphis [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge				$ 704,000		$ 626,000	$ 1,390,000			$ 698,000
Net proceeds from sale of property					2,151,000			1,485,000	945,000
Settlement income	$ 592,000	$ 5,868,000								$ 592,000
Discontinued Operations (Textual) [Abstract]
Retail Space of leased properties			281,000