Note 8 - Other Real Estate Investments - Preferred Equity Investments - Balance Sheet Disclosures (Details) - Preferred Equity Investments [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Real estate, net	$ 91.6	$ 110.4
Other assets	484.6	578.8
Total Assets	576.2	689.2
Mortgages payable, net	236.1	314.0
Other liabilities	2.6	3.0
Partners’/Members’ capital	337.5	372.2
Total Liabilities and Partners'/Members Capital	$ 576.2	$ 689.2