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Note 6 - Impairments - Asset Impairment Charges (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Gross property impairment charges |  | $ 3,597 | $ 6,624 | $ 48,743
Total net impairment charges |  | 3,600 | 6,600 | 48,700
Properties Marketed for Sale [Member] |  |  |  |
Gross property impairment charges | [1] | 2,700 | 5,500 | 12,500
Disposed Operating Properties [Member] |  |  |  |
Gross property impairment charges | [2] | 0 | 1,100 | 36,200
Cost Method Investment [Member] |  |  |  |
Gross property impairment charges | [3] | $ 900 | $ 0 | $ 0
[1] | Amounts relate to adjustments to property carrying values for properties which the Company has marketed for sale as part of its capital recycling program and as such has adjusted the anticipated hold periods for such properties.
[2] | Amounts relate to dispositions/deeds in lieu/foreclosures during the respective years shown.
[3] | Amounts relate to a cost method investment during the respective years shown.

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- Definition The net of tax amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228 + Details
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