Note 7 - Investments In and Advances to Real Estate Joint Ventures - Investment Details (Details) - USD ($)		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
The company's investment		$ 11,929,276,453	$ 11,877,190,495	$ 12,653,444,998	$ 12,008,075,148
Kim Pru and Kim Pru II [Member]
Average ownership interest	[1],[2]	15.00%
The company's investment	[1],[2]	$ 169,500,000	175,200,000
Kimco Income Fund [Member]
Average ownership interest	[2]	48.60%
The company's investment	[2]	$ 175,000,000.0	167,200,000
CPP [Member]
Average ownership interest	[2]	55.00%
The company's investment	[2]	$ 151,700,000	135,000,000.0
Other Joint Venture Programs [Member]
The company's investment	[3]	81,900,000	93,500,000
All Equity Method Investments [Member]
The company's investment	[4]	$ 578,100,000	$ 570,900,000

[1] Represents four separate joint ventures, with four separate accounts managed by Prudential Global Investment Management. One of these ventures disposed of all its properties during 2019.

[2] The Company manages these joint venture investments and, where applicable, earns acquisition fees, leasing commissions, property management fees, asset management fees and construction management fees.

[3] During March 2018, the Company sold a portion of its investment in an operating property to its partner and amended the partnership agreement to provide for joint control of the entity. As a result of the amendment, the Company no longer consolidates the entity. As of the date of deconsolidation, the Company had an investment in this unconsolidated property of $62.4 million.

[4] Representing 98 property interests and 21.3 million square feet of GLA, as of December 31, 2019, and 109 property interests and 23.2 million square feet of GLA, as of December 31, 2018.