Note 6 - Impairments - Asset Impairment Charges (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Asset Impairment Charges, Total		$ 21,958	$ 3,597	$ 6,624
Total impairment charges		22,000	3,600	6,600
Properties Marketed for Sale [Member]
Asset Impairment Charges, Total	[1]	21,600	2,700	5,500
Disposed Operating Properties [Member]
Asset Impairment Charges, Total		0	0	1,100
Cost Method Investment [Member]
Asset Impairment Charges, Total		$ 400	$ 900	$ 0

[1] Amounts relate to adjustments to property carrying values for properties which the Company has marketed for sale and as such has adjusted the anticipated hold periods for such properties. During 2022, the Company recognized impairment charges of $19.2 million, before noncontrolling interests of $16.0 million, related to five properties. The Company’s estimated fair values of these assets were primarily based upon sales prices from signed contracts, which were less than the carrying value of the assets.