Note 4 - Real Estate - Disposition Activity (Details) - Disposition Activity Relating to Consolidated Operating Properties and Parcels [Member] $ in Millions		1 Months Ended	9 Months Ended
		Jan. 31, 2021	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Aggregate sales price (1)	[1]		$ 172.2	$ 156.6
Gain on sale of properties	[2]		$ 11.0	$ 30.8
Number of properties sold		2	8	5
Number of parcels sold			10	9

[1] Includes $19.7 million of Internal Revenue Code 26 U.S.C. §1031 proceeds held in escrow through sale of real estate interests for the nine months ended September 30, 2022.

[2] Before noncontrolling interests of $3.0 million and taxes of $2.2 million, after utilization of net operating loss carryforwards, for the nine months ended September 30, 2021.