Note 7 - Investment and Advances in Real Estate Joint Ventures (Details) - Summarized Financial Information for RioCan - Income Statements (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Revenues from rental properties	$ 935,100,000	$ 1,066,800,000	$ 1,109,300,000
Operating expenses	(297,600,000)	(348,100,000)	(388,800,000)
Interest expense	(253,600,000)	(306,900,000)	(329,400,000)
Depreciation and amortization	(242,000,000)	(277,600,000)	(322,600,000)
Other (expense)/income, net	(14,500,000)	(11,300,000)	7,400,000
	(840,000,000)	(969,800,000)	(1,046,900,000)
Net income	325,600,000	166,400,000	17,200,000
RioCan [Member]
Schedule of Equity Method Investments [Line Items]
Revenues from rental properties	209,900	213,300	209,200
Operating expenses	(76,900)	(78,100)	(73,000)
Interest expense	(40,100)	(51,900)	(57,500)
Depreciation and amortization	(36,000)	(37,300)	(36,800)
Other (expense)/income, net	(1,800)	14,700	(200)
	(154,800)	(152,600)	(167,500)
Net income	$ 55,100	$ 60,700	$ 41,700