Note 6 - Investments in and Advances to Real Estate Joint Ventures - Investment Details (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
The company's investment		$ 18,937,794	$ 18,457,242	$ 18,052,271	$ 12,068,827
Kim Pru and Kim Pru II [Member]
Average ownership interest		15.00%
The company's investment		$ 138,700	153,600
Kimco Income Fund [Member]
Average ownership interest		52.10%
The company's investment		$ 286,300	281,500
CPP [Member]
Average ownership interest		55.00%
The company's investment		$ 204,600	190,800
Other Institutional Joint Ventures [Member]
The company's investment		247,500	256,800
Other Joint Venture Programs [Member]
The company's investment		210,700	208,900
All Equity Method Investments [Member]
The company's investment	[1]	$ 1,087,800	$ 1,091,600

[1] Representing 104 property interests and 21.1 million square feet of GLA, as of December 31, 2023, and 111 property interests and 22.4 million square feet of GLA, as of December 31, 2022.