Note 6 - Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Variable Interest Entity, Primary Beneficiary [Member] | Ground Up Developments [Member]
Note 6 - Variable Interest Entities (Details) [Line Items]
Number of Consolidated Entities	2
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 88.1
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0.2
Variable Interest Entity, Financial or Other Support, Amount	35.6
Variable Interest Entity, Not Primary Beneficiary [Member] | Ground Up Developments [Member]
Note 6 - Variable Interest Entities (Details) [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net	18.2
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	19.6
Variable Interest Entity, Financial or Other Support, Future Funding	1.4
Variable Interest Entity, Not Primary Beneficiary [Member] | Preferred Equity Investments [Member]
Note 6 - Variable Interest Entities (Details) [Line Items]
Number of Consolidated Entities	1
Variable Interest Entity, Not Primary Beneficiary [Member] | Redevelopment [Member]
Note 6 - Variable Interest Entities (Details) [Line Items]
Variable Interest Entity, Financial or Other Support, Amount	(11.1)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 11.1