Note 7 - Investments In and Advances to Real Estate Joint Ventures - Investment Details (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
The company's investment		$ 18,052,271	$ 12,068,827	$ 11,929,276	$ 11,877,190
Kim Pru and Kim Pru II [Member]
Average ownership interest		15.00%
The company's investment		$ 163,000	175,100
Kimco Income Fund [Member]
Average ownership interest		48.60%
The company's investment		$ 186,000	177,400
CPP [Member]
Average ownership interest		55.00%
The company's investment		$ 165,100	159,700
Other Institutional Joint Ventures [Member]
The company's investment	[1],[2]	281,800	0
Other Joint Venture Programs [Member]
The company's investment	[2]	211,000	78,500
All Equity Method Investments [Member]
The company's investment	[3]	$ 1,006,900	$ 590,700

[1] During 2021, the Company entered into a new joint venture with BREIT in which it contributed six properties for a gross sales price of $425.8 million. See Footnote 5 of the Notes to Consolidated Financial Statements for the operating properties disposed by the Company.

[2] In connection with the Merger, the Company acquired ownership in 9 unconsolidated joint ventures, which have a fair market value of $586.2 million at the time of Merger. These joint ventures represented 30 property interests and 4.4 million square feet of GLA.

[3] Representing 120 property interests and 24.7 million square feet of GLA, as of December 31, 2021, and 97 property interests and 21.2 million square feet of GLA, as of December 31, 2020.