Note 6 - Investment In and Advances to Real Estate Joint Ventures (Details Textual) ft² in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($) ft²	Dec. 31, 2021
Gross Leasable Area (Square Foot) | ft²		1,145	934
Number of Properties Sold	[1],[2]	6	9	13
Other Liabilities		$ 599,961	$ 601,574
Prudential Investment Program [Member] | Operating Properties [Member]
Subsidiary, Ownership Percentage, Parent		85.00%
Real Estate Investments, Net		$ 150,700
Gain (Loss) on Change of Control of Equity Investments		$ 7,700
Prudential Investment Program [Member]
Tangible Asset Impairment Charges, Total			$ 15,100
All Equity Method Investments [Member]
Number of Real Estate Properties		104	111
Gross Leasable Area (Square Foot) | ft²		21,100	22,400
Kimco Income Fund [Member]
Payments to Acquire Interest in Subsidiaries and Affiliates, Total			$ 55,100
Equity Method Investment, Ownership Percentage		52.10%
Kimco Income Fund [Member] | Board of Directors Chairman [Member]
Payments to Acquire Interest in Subsidiaries and Affiliates, Total			100
Prudential Investment Program [Member]
Tangible Asset Impairment Charges, Total			$ 2,300
Real Estate Joint Ventures [Member] | Operating Properties [Member]
Number of Properties Sold		4	9
Equity Method Investment, Sales Price		$ 132,300	$ 349,100
Equity Method Investment, Realized Gain (Loss) on Disposal		$ 300	$ 39,300
Number of Land Parcels Sold			2
KIR [Member]
Equity Method Investment, Ownership Percentage		52.10%
Other Joint Venture Programs [Member]
Other Liabilities		$ 5,100	$ 5,300
Investments in and Advances to Real Estate Joint Ventures [Member]
Equity Method Investments		$ 1,087,804	$ 1,091,551

[1] During 2021, the Company purchased its partner’s 70.0% remaining interest in Jamestown Portfolio, which is comprised of six property interests. The Company then entered into a joint venture with Blackstone Real Estate Income Trust, Inc. (“BREIT”) in which it contributed these six properties for a gross sales price of $425.8 million, including $170.0 million of non-recourse mortgage debt. As a result, the Company no longer consolidates these six property interests and recognized a loss on change in control of interests of $0.4 million. The Company has a 50.0% investment in this joint venture ($130.1 million as of the date of deconsolidation), included in Investments in and advances to real estate joint ventures on the Company’s Consolidated Balance Sheets.

[2] During 2023, the Company contributed a land parcel and related entitlements, located in Admore, PA, into a preferred equity investment with a gross value of $19.6 million. As a result, the Company no longer consolidates this land parcel and has a non-controlling interest in this investment. See Footnote 7 of the Notes to the Company’s Consolidated Financial Statements for preferred equity investment disclosure.