Note 3 - Real Estate (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Asset, Acquired-in-Place Leases	$ 213,915,000	$ 196,124,000
Finite-Lived Customer Relationships, Gross	21,444,000	21,704,000
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross	100,500,000	88,494,000
Off-market Lease, Unfavorable	165,000,000	164,900,000
Amortization	16,400,000	13,600,000	8,000,000
Future Amortization Expense, Year One	11,700,000
Future Amortization Expense, Year Two	8,300,000
Future Amortization Expense, Year Three	200,000
Future Amortization Expense, Year Four	(2,300,000)
Future Amortization Expense, Year Five	(4,300,000)
Other Rental Property [Member]
Finite-Lived Intangible Assets, Accumulated Amortization	180,700,000	147,200,000
Below Market Rents [Member]
Finite-Lived Intangible Assets, Accumulated Amortization	$ 120,500,000	$ 101,000,000