Note 6 - Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Consolidated Ground-Up Development Projects [Member]
Note 6 - Variable Interest Entities (Details) [Line Items]
Number of Consolidated Entities	2
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 85.5
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0.4
Variable Interest Entity, Financial or Other Support, Amount	33.1
Unconsolidated Ground-Up Development [Member]
Note 6 - Variable Interest Entities (Details) [Line Items]
Variable Interest Entity, Financial or Other Support, Amount	18.4
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net	17.4
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	35.8
Unconsolidated Redevelopment Investment [Member]
Note 6 - Variable Interest Entities (Details) [Line Items]
Variable Interest Entity, Financial or Other Support, Amount	11.2
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net	$ (11.2)
Number of Unconsolidated Entities	1