Real Estate (Details 2) (USD $)	3 Months Ended	6 Months Ended		1 Months Ended		1 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 11, 2012 sqft	Dec. 31, 2011 Flex/office property located in Amesbury, MA	Dec. 22, 2011 Flex/office property located in Amesbury, MA sqft	Apr. 30, 2012 Warehouse and distribution facility located in Youngstown, OH	Apr. 20, 2012 Warehouse and distribution facility located in Youngstown, OH sqft
Disposal of real estate properties
Gain on sale of real estate	$ 219,000	$ 219,000				$ 200,000
Net rentable square feet			190,000		78,000		153,708
Sales price				4,800,000		3,400,000
Net proceeds from sale of discontinued operations		$ 3,216,000		$ 4,500,000		$ 3,200,000