Note 3 - Real Estate - Disposition Activity (Details) - Disposition Activity Relating to Consolidated Operating Properties and Parcels [Member] $ in Millions		3 Months Ended
		Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Aggregate sales price/gross fair value (1) (2)	[1],[2]	$ 117.6	$ 8.7
Gain on sale of properties (3)	[3]	$ 39.2	$ 4.2
Number of properties sold		3	0
Number of parcels sold/(deconsolidated) (1)	[1]	3	4

[1] During 2023, the Company contributed a land parcel and related entitlements, located in Admore, PA, into a preferred equity investment with a gross value of $19.6 million. As a result, the Company no longer consolidates this land parcel and has a non-controlling interest in this investment. See Footnote 5 of the Notes to the Company's Condensed Consolidated Financial Statements for preferred equity investment disclosure.

[2] During 2023, the Company provided as a lender seller financing of $25.0 million related to the sale of an operating property located in Gresham, OR. See Footnote 9 of the Notes to the Company's Condensed Consolidated Financial Statements for mortgage receivable loan disclosure.

[3] Before noncontrolling interests of $1.5 million and taxes of $1.2 million for the three months ended March 31, 2023.