Note 9 - Other Real Estate Investments - Preferred Equity Investments - Balance Sheet Disclosures (Details) - Preferred Equity Investments [Member] - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Assets:
Assets	$ 774.1	$ 886.3
Liabilities and Partners’/Members’ Capital:
Partners’/Members’ capital	311.1	309.7
	774.1	886.3
Real Estate, Net [Member]
Assets:
Assets	187.0	258.0
Other Assets [Member]
Assets:
Assets	587.1	628.3
Notes and Mortgage Payable [Member]
Liabilities and Partners’/Members’ Capital:
Liabilities	454.7	563.7
Other Liabilities [Member]
Liabilities and Partners’/Members’ Capital:
Liabilities	$ 8.3	$ 12.9