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Note 5 - Investments In and Advances to Real Estate Joint Ventures - Joint Venture Investments Accounted for Under the Equity Method, Debt Details (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2022	Dec. 31, 2021
Mortgage and notes payable		$ 1,414.5	$ 1,638.7
Prudential Investment Program [Member]
Mortgage and notes payable		$ 381.0	$ 426.9
Weighted average interest rate		4.28%	2.02%
Weighted average remaining term (Month)	[1]	36 months 3 days	45 months 18 days
KIR [Member]
Mortgage and notes payable		$ 324.9	$ 492.6
Weighted average interest rate		4.21%	2.55%
Weighted average remaining term (Month)	[1]	46 months 12 days	27 months 27 days
CPP [Member]
Mortgage and notes payable		$ 83.4	$ 84.2
Weighted average interest rate		4.89%	1.85%
Weighted average remaining term (Month)	[1]	46 months 3 days	55 months
Other Institutional Joint Ventures [Member]
Mortgage and notes payable		$ 233.3	$ 232.9
Weighted average interest rate		4.30%	1.65%
Weighted average remaining term (Month)	[1]	50 months 21 days	59 months 21 days
Other Joint Venture Programs [Member]
Mortgage and notes payable		$ 391.9	$ 402.1
Weighted average interest rate		3.99%	3.58%
Weighted average remaining term (Month)	[1]	74 months 18 days	83 months
[1] Includes extension options

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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