Property Transactions (Details 1) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Components of Income (Loss) from Discontinued Operations
Rental property revenues	$ 1,065,000	$ 5,421,000	$ 3,367,000	$ 11,276,000
Discontinued Operations Other Income	13,000	89,000	13,000	114,000
Rental property operating expenses	(524,000)	(2,404,000)	(1,417,000)	(4,766,000)
Depreciation and amortization	0	(2,479,000)	(1,145,000)	(5,037,000)
Income from discontinued operations	554,000	627,000	818,000	1,587,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	674,000	0	760,000	(384,000)
The Avenue Collierville [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Footage of Real Estate Property	511,000		511,000
Sales Price of Property Sold Discontinued Operations			55,000,000
Components of Income (Loss) from Discontinued Operations
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	86,000	0	86,000	0
Galleria 75 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Footage of Real Estate Property	111,000		111,000
Sales Price of Property Sold Discontinued Operations			9,200,000
Components of Income (Loss) from Discontinued Operations
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	547,000	0	547,000	0
Jefferson Mill Business Park Building A [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Footage of Real Estate Property		459,000		459,000
Sales Price of Property Sold Discontinued Operations				22,000,000
Components of Income (Loss) from Discontinued Operations
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	0	0	0	(394,000)
Other [Member]
Components of Income (Loss) from Discontinued Operations
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$ 41,000	$ 0	$ 127,000	$ 10,000