Note 9 - Variable Interest Entities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Ground Up Developments [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Note 9 - Variable Interest Entities (Details) [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 78.4
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0.1
Variable Interest Entity, Financial or Other Support, Amount	$ 17.4
Preferred Equity Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Note 9 - Variable Interest Entities (Details) [Line Items]
Number of Consolidated Entities	1
Redevelopment [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Note 9 - Variable Interest Entities (Details) [Line Items]
Variable Interest Entity, Financial or Other Support, Amount	$ (7.4)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 7.4