Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		9 Months Ended						3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Aug. 28, 2012	Jun. 27, 2012	Dec. 31, 2011	Aug. 08, 2012 Interest Rate Swap [Member] Paradise Plaza [Member]	Sep. 30, 2012 Cash Flow Hedging [Member]	Sep. 30, 2012 Cash Flow Hedging [Member]	Sep. 30, 2012 Prime Rate Less Two Point Zero Zero Percent Due 2017 [Member] Floating Rate Notes [Member]	Dec. 31, 2011 Prime Rate Less Two Point Zero Zero Percent Due 2017 [Member] Floating Rate Notes [Member]	Aug. 08, 2012 Prime Rate Less Two Point Zero Zero Percent Due 2017 [Member] Floating Rate Notes [Member] Paradise Plaza [Member]
Summary of Significant Accounting Policies [Line Items]
Face amount of debt											$ 9,200,000	$ 9,200,000	$ 9,200,000
Common shares, par value per share (in dollars per share)	$ 0.001		$ 0.001		$ 0.001	$ 0.001	$ 0.001
Conversion basis for common shares to OP units	1		1
Gains on the sale of marketable securities	78,000	154,000	110,000	192,000
Investment in available-for-sale marketable securities	1,373,000		1,373,000				5,131,000
Aggregate unrealized loss on available-for-sale marketable securities	(438,000)		(438,000)
Stated interest rate								5.716%
Fair value of cash flow hedge									(1,800,000)	(1,800,000)
Cash flow hedge recognized into earnings									0	0
Cash flow hedge losses recognized as other comprehensive loss									9,000
Interest expense capitalized	47,000		135,000
Real estate tax capitalized	50,000		113,000
Share-based compensation	$ 118,000	$ 78,000	$ 384,000	$ 233,000