Note 6 - Variable Interest Entities ("VIE") (Details Textual) - Variable Interest Entity, Primary Beneficiary [Member]	6 Months Ended
	Jun. 30, 2016 USD ($)
Consolidated Operating Properties [Member]
Variable Interest Entity, Number of Entities	18
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 632,000,000
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	$ 34,900,000
Redevelopment [Member]
Number of Consolidated Entities	1
Variable Interest Entity, Financial or Other Support, Amount	$ (7,400,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 7,400,000
Consolidated Real Estate Under Development Project [Member]
Number of Consolidated Entities	2
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 167,600,000
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	5,600,000
Variable Interest Entity, Financial or Other Support, Amount	$ 82,800,000