Note 5 - Investments and Advances in Real Estate Joint Ventures (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Equity Method Investment, Other than Temporary Impairment	$ 3,123,000	$ 3,123,000
CPP [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price	52,000,000	52,000,000
BIG Shopping Centers [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price	43,500,000	43,500,000
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred	34,100,000	34,100,000
Total Impairment [Member] | Kim Pru [Member]
Impairment of Real Estate		40,100,000
Total Impairment [Member] | Kim PruII [Member]
Impairment of Real Estate		7,300,000
Companys Share OfImpairment [Member] | Kim Pru [Member]
Impairment of Real Estate		4,500,000
Companys Share OfImpairment [Member] | Kim PruII [Member]
Impairment of Real Estate		1,000,000
Total Gain OnExtinguishment OfDebt [Member] | Kim Pru [Member]
Gains (Losses) on Extinguishment of Debt		30,100,000
Companys Share OfExtinguishment OfDebt [Member] | Kim Pru [Member]
Gains (Losses) on Extinguishment of Debt		$ 4,500,000