Note 6 - Variable Interest Entities (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Ground Up Developments [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Note 6 - Variable Interest Entities (Details) [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 78.1
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0.4
Variable Interest Entity, Financial or Other Support, Amount	32.8
Redevelopment [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Note 6 - 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