Note 3 - Real Estate (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Asset, Acquired-in-Place Leases	$ 237,166,000	$ 213,915,000
Finite-Lived Customer Relationships, Gross	21,335,000	21,444,000
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross	99,166,000	100,500,000
Off-market Lease, Unfavorable	167,200,000	165,000,000
Amortization	15,400,000	15,200,000	12,600,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	9,600,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1,700,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	(800,000)
Finite-Lived Intangible Assets, Amortization Expense, Year Four	(3,400,000)
Finite-Lived Intangible Assets, Amortization Expense, Year Five	(3,000,000)
Other Rental Property [Member]
Finite-Lived Intangible Assets, Accumulated Amortization	212,900,000	180,700,000
Below Market Rents [Member]
Finite-Lived Intangible Assets, Accumulated Amortization	$ 138,300,000	$ 120,500,000