Note 9 - Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Variable Interest Entity, Primary Beneficiary [Member] | Ground Up Developments [Member]
Note 9 - Variable Interest Entities (Details) [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 77.7
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0.1
Variable Interest Entity, Financial or Other Support, Amount	32.8
Variable Interest Entity, Not Primary Beneficiary [Member] | Ground Up Developments [Member]
Note 9 - Variable Interest Entities (Details) [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net	35.1
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	35.1
Variable Interest Entity, Not Primary Beneficiary [Member] | Preferred Equity Investments [Member]
Note 9 - Variable Interest Entities (Details) [Line Items]
Number of Consolidated Entities	1
Variable Interest Entity, Not Primary Beneficiary [Member] | Redevelopment [Member]
Note 9 - Variable Interest Entities (Details) [Line Items]
Variable Interest Entity, Financial or Other Support, Amount	(9.9)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 9.9