Note 3 - Real Estate - Disposition Activity (Details) - Disposition Activity Relating to Consolidated Operating Properties and Parcels [Member] $ in Millions		3 Months Ended
		Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Aggregate sales price		$ 8.7	$ 23.0
Gain on sale of properties	[1]	$ 4.2	$ 10.0
Number of properties sold		0	1
Number of parcels sold		4	4

[1] Before noncontrolling interests of $3.0 million and taxes of $1.0 million, for the three months ended March 31, 2021.