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Note 7 - Investments In and Advances to Real Estate Joint Ventures - Investment Details (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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The company's investment |  | $ 12,068,827,149 | $ 11,929,276,453 | $ 11,877,190,495 | $ 12,653,444,998
Kim Pru and Kim Pru II [Member] |  |  |  |  |
Average ownership interest | [1],[2] | 15.00% |  |  |
The company's investment | [1],[2] | $ 175,100,000 | 169,500,000 |  |
Kimco Income Fund [Member] |  |  |  |  |
Average ownership interest | [2] | 48.60% |  |  |
The company's investment | [2] | $ 177,400,000 | 175,000,000.0 |  |
CPP [Member] |  |  |  |  |
Average ownership interest | [2] | 55.00% |  |  |
The company's investment | [2] | $ 159,700,000 | 151,700,000 |  |
Other Joint Venture Programs [Member] |  |  |  |  |
The company's investment |  | 78,500,000 | 81,900,000 |  |
All Equity Method Investments [Member] |  |  |  |  |
The company's investment | [3] | $ 590,700,000 | $ 578,100,000 |  |
[1] | Represents three separate joint ventures, with three separate accounts managed by Prudential Global Investment Management.
[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] | Representing 97 property interests and 21.2 million square feet of GLA, as of December 31, 2020, and 98 property interests and 21.3 million square feet of GLA, as of December 31, 2019.

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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