Note 5 - Investment in and Advances to Real Estate Joint Ventures - Investment Details (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Kim Pru and Kim Pru II [Member]
Average ownership interest	[1],[2]	15.00%
The company's investment	[1],[2]	$ 175.1	$ 175.2
Kimco Income Fund [Member]
Average ownership interest	[2]	48.60%
The company's investment	[2]	$ 160.5	167.2
CPP [Member]
Average ownership interest	[2]	55.00%
The company's investment	[2]	$ 140.0	135.0
Other Joint Venture Programs [Member]
The company's investment		91.3	93.5
All Equity Method Investments [Member]
The company's investment	[3]	$ 566.9	$ 570.9

[1] Represents four separate joint ventures, with four separate accounts managed by Prudential Global Investment Management ("PGIM"), three of these ventures are collectively referred to as KimPru and the remaining venture is referred to as KimPru II.

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

[3] Representing 105 property interests and 22.8 million square feet of GLA, as of March 31, 2019, and 109 property interests and 23.2 million square feet of GLA, as of December 31, 2018.