Note 5 - Dispositions of Real Estate - Disposition Activity (Details) $ in Millions		12 Months Ended
		Dec. 31, 2021 USD ($)	[1]	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	[2]
Aggregate sales price/gross fair value		$ 612.4		$ 31.8	$ 344.7
Number of operating properties sold/deconsolidated		13		3	20
Disposition Activity Relating to Consolidated Operating Properties and Parcels [Member]
Gain on sale of properties	[3]	$ 30.8		$ 6.5	$ 79.2
Number of parcels sold		10		4	9

[1] During 2021, the Company purchased its partner’s 70.0% remaining interest in Jamestown Portfolio, which is comprised of six property interests. The Company then entered into a joint venture with Blackstone Real Estate Income Trust, Inc. (“BREIT”) in which it contributed these six properties for a gross sales price of $425.8 million, including $170.0 million of non-recourse mortgage debt. As a result, the Company no longer consolidates these six property interests and recognized a loss on change in control of interests of $0.4 million. The Company has a 50.0% investment in this joint venture ($130.1 million as of the date of deconsolidation), included in Investments in and advances to real estate joint ventures on the Company’s Consolidated Balance Sheets.

[2] Includes the sale of a land parcel at a development project located in Dania Beach, FL for a sales price of $32.5 million, which resulted in a gain of $4.3 million.

[3] Before noncontrolling interests of $3.0 million and taxes of $2.2 million, after utilization of net operating loss carryforwards, for the year ended December 31, 2021.