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Note 4 - Investments in and Advances to Real Estate Joint Ventures (Details Textual) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 USD ($) ft² | Sep. 30, 2022 USD ($) ft² | Dec. 31, 2022 ft²
Gross Leasable Area (Square Foot) | ft² | 1,132 | 398 |
Prudential Investment Program [Member] | Operating Properties [Member] |  |  |
Subsidiary, Ownership Percentage, Parent | 85.00% |  |
Real Estate Investments, Net | $ 150.7 |  |
Gain (Loss) on Change of Control of Equity Investments | $ 7.7 |  |
All Equity Method Investments [Member] |  |  |
Number of Real Estate Properties | 107 |  | 111
Gross Leasable Area (Square Foot) | ft² | 21,700,000 |  | 22,400,000
Real Estate Joint Ventures [Member] | Operating Properties [Member] |  |  |
Equity Method Investment, Sales Price | $ 29.5 | $ 326.5 |
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 1.3 | $ 37.3 |
Number of Real Estate Properties, Interest Disposed of or Transferred |  | 8 |

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- Definition Amount of gain (loss) on sale or disposal of an equity method investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(7)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(9)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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