Note 4 - Investments and Advances in Real Estate Joint Ventures - Investment Details (Details) ft² in Thousands, $ in Millions		Sep. 30, 2016 USD ($) ft²		Dec. 31, 2015 USD ($) ft²	Sep. 30, 2015
Kim Pru and Kim Pru II [Member]
Average ownership interest	[1],[2]	15.00%		15.00%
Number of properties	[1],[2]	50		53
Total GLA | ft²	[1],[2]	9,200		9,600
Gross investment in real estate	[1],[2]	$ 2,482.5		$ 2,531.6
The company's investment	[1],[2]	$ 163.5		$ 175.5
Kimco Income Fund [Member]
Average ownership interest	[2]	48.60%		48.60%
Number of properties	[2]	46		47
Total GLA | ft²	[2]	10,600		10,800
Gross investment in real estate	[2]	$ 1,421.6		$ 1,422.8
The company's investment	[2]	$ 136.0		$ 131.0
CPP [Member]
Average ownership interest	[2]	55.00%		55.00%
Number of properties	[2]	5		7
Total GLA | ft²	[2]	1,500		2,400
Gross investment in real estate	[2]	$ 306.3		$ 524.1
The company's investment		$ 95.8	[2]	$ 195.6
Other Institutional Programs [Member]
Number of properties	[2]	2		9
Total GLA | ft²	[2]	300		1,500
Gross investment in real estate	[2]	$ 117.9		$ 301.5
The company's investment	[2]	$ 0.4		$ 5.2
Other Joint Venture Programs [Member]
Number of properties		38		40
Total GLA | ft²		5,300		5,200
Gross investment in real estate		$ 765.7		$ 782.8
The company's investment		$ 77.9		$ 64.0
Canadian Properties [Member]
Average ownership interest		50.00%
Number of properties		1		35
Total GLA | ft²		300		5,900
Gross investment in real estate		$ 17.6		$ 695.3
The company's investment		$ 4.2		$ 171.3
All Equity Method Investments [Member]
Number of properties		142		191
Total GLA | ft²		27,200		35,400
Gross investment in real estate		$ 5,111.6		$ 6,258.1
The company's investment		$ 477.8		$ 742.6
Number of properties		46			23
Total GLA | ft²	[3]	2,066

[1] Represents four separate joint ventures, with four separate accounts managed by Prudential Real Estate Investors ("PREI"), 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 acquisition fees, leasing commissions, property management fees, asset management fees and construction management fees.

[3] Gross leasable area ("GLA")