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Note 7 - Marketable Securities - Amortized Cost and Unrealized Gain (Loss) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost | $ 2,702 | $ 40,110
Unrealized gains, net | 35 | 289,947
Marketable securities | $ 2,737 | $ 330,057

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- Definition The item represents the total cost of debt and equity securities, including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References No definition available. + Details
Name: | kim_MarketableSecuritiesAmortizedCost
Namespace Prefix: | kim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of unrealized gain (loss) on investment in marketable security. + References No definition available. + Details
Name: | kim_MarketableSecuritiesGrossUnrealizedGainLoss
Namespace Prefix: | kim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_MarketableSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant