Note 7 - Investments In and Advances to Real Estate Joint Ventures (Details Textual) $ in Thousands		1 Months Ended	12 Months Ended
		Oct. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) ft²	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)	Aug. 03, 2021 USD ($) ft²
Gross Leasable Area (Square Foot) | ft²	[1]		3,256
Joint Venture, Number of Property Interests		6
Payments to Acquire Interest in Joint Venture		$ 425,800	$ 12,571	$ 15,882	$ 27,665
Other Liabilities, Total			510,382	324,538
Equity Method Investments			$ 1,000,000	$ 590,700
Weingarten Realty Investors [Member]
Secured Debt Assumed by Joint Ventures in Business Combination, Including Fair Market Value Adjustment						$ 191,500
Secured Debt Assumed by Joint Ventures in Business Combination, Fair Market Value Adjustment						$ 800
Prudential Investment Program [Member]
Tangible Asset Impairment Charges, Total					29,900
All Equity Method Investments [Member]
Number of Real Estate Properties			120	97
Gross Leasable Area (Square Foot) | ft²			24.7	21,200,000
Unconsolidated Joint Ventures Acquired in Weingarten Merger [Member]
Number of Real Estate Properties						30
Gross Leasable Area (Square Foot) | ft²						4,400,000
Number of Joint Ventures						9
Joint Ventures, Fair Market Value						$ 586,200
Prudential Investment Program [Member]
Tangible Asset Impairment Charges, Total					$ 3,700
Real Estate Joint Ventures [Member] | Operating Properties [Member]
Number of Real Estate Properties, Interest Disposed of or Transferred			4		9
Number of Land Parcels Sold			1
Equity Method Investment, Sales Price			$ 88,900		$ 247,400
Equity Method Investment, Realized Gain (Loss) on Disposal, Total			$ 9,900		$ 14,400
Number of Real Estate Properties, Remaining Interest Acquired			9
Real Estate Investments, Net, Total			$ 780,100
Gain (Loss) on Change of Control of Equity Investments			5,000
KIR [Member]
Equity Method Investment, Ownership Percentage				48.60%
Other Joint Venture Programs [Member]
Other Liabilities, Total			$ 4,800	$ 3,700

[1] Gross leasable area ("GLA")