Note 3 - Real Estate - Disposition Activity (Details) - Disposition Activity Relating to Consolidated Operating Properties and Parcels [Member] $ in Millions		6 Months Ended
		Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Aggregate sales price		$ 43.3	$ 132.2
Gain on sale of properties	[1]	$ 7.1	$ 28.9
Number of properties sold		1	3
Number of parcels sold		8	7

[1] Before noncontrolling interests of $3.1 million and taxes of $2.1 million, after utilization of net operating loss carryforwards, for the six months ended June 30, 2021.