Note 3 - Weingarten Merger - Information Regarding Consideration Transferred, Purchase Price Allocation, and Asset Lives (Details) - USD ($) $ / shares in Units, $ in Thousands			2 Months Ended	9 Months Ended
		Aug. 03, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Below-market leases			$ (120,441)	$ (120,441)	$ 0
Operating right-of-use intangible assets, weighted average amortization period (Year)			25 years 8 months 12 days	25 years 8 months 12 days
Leases, Acquired-in-Place [Member]
In-place leases			$ 11,120	$ 11,120
Intangible assets, weighted average amortization period (Year)				20 years
Tenant Improvements [Member]
In-place leases			711	$ 711
Intangible assets, weighted average amortization period (Year)				20 years
Building [Member]
Weighted-average amortization period, Property Plant and Equipment (Year)				50 years
Building Improvements [Member]
Weighted-average amortization period, Property Plant and Equipment (Year)				45 years
Below-market Leases [Member]
In-place leases			21,300	$ 21,300
Intangible assets, weighted average amortization period (Year)				60 years
Weingarten Realty Investors [Member]
Price of Kimco Common Stock (in dollars per share)		$ 20.78
Kimco common stock issued (in shares)		179,919,880
Calculated Value of WRI Consideration		$ 3,738,735
Cash Consideration	[1]	320,424
Total Value of Consideration		$ 4,059,159
Land			1,166,922	$ 1,166,922
Building and improvements			4,041,244	4,041,244
Real estate assets			5,624,707	5,624,707	0
Investments in and advances to real estate joint ventures			586,248	586,248	0
Cash, accounts receivable and other assets			242,399	242,399
Total assets acquired			6,453,354	6,453,354
Notes payable			(1,497,632)	(1,497,632)	0
Mortgages payable			(317,671)	(317,671)	0
Accounts payable and other liabilities			(279,414)	(279,414)
Below-market leases			(120,441)	(120,441)
Noncontrolling interests			(179,037)	(179,037)	$ 0
Total liabilities assumed			(2,394,195)	(2,394,195)
Total purchase price			$ 4,059,159	$ 4,059,159
Operating right-of-use intangible assets, weighted average amortization period (Year)			24 years 2 months 12 days	24 years 2 months 12 days
Fair market value of debt adjustment (Year)			3 years 9 months 18 days
Weingarten Realty Investors [Member] | Leases, Acquired-in-Place [Member]
In-place leases			$ 374,281	$ 374,281
Intangible assets, weighted average amortization period (Year)			2 years 6 months
Weingarten Realty Investors [Member] | Above Market Leases [Member]
In-place leases			$ 42,260	$ 42,260
Intangible assets, weighted average amortization period (Year)			5 years 2 months 12 days
Weingarten Realty Investors [Member] | Tenant Improvements [Member]
Weighted-average amortization period, Property Plant and Equipment (Year)			4 years
Weingarten Realty Investors [Member] | Building [Member]
Weighted-average amortization period, Property Plant and Equipment (Year)			50 years
Weingarten Realty Investors [Member] | Building Improvements [Member]
Weighted-average amortization period, Property Plant and Equipment (Year)			45 years
Weingarten Realty Investors [Member] | Fixtures and Leasehold Improvements [Member]
Weighted-average amortization period, Property Plant and Equipment (Year)			7 years
Weingarten Realty Investors [Member] | Below-market Leases [Member]
Weighted-average amortization period, Property Plant and Equipment (Year)			16 years 10 months 24 days

[1] Amounts include additional consideration of $39.1 million relating to reimbursements paid by Kimco to WRI at the closing of the Merger.