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

Represents the amount of sale price for the entity's equity method investment.

No definition available.

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- Definition

The amount of gain (loss) on change of control of equity investments.

+ References

No definition available.

+ Details

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- Definition

The amount of floor space available to be rented in a commercial property.

+ References

No definition available.

+ Details

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- Definition

Represents the number of real estate property interests disposed of or transferred.

+ References

No definition available.

+ Details

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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

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(d))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(3)(d))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1

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