Note 25 - Captive Insurance Company (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Letters of Credit Outstanding, Amount	$ 36,200,000
Kimco Insurance Company [Member]
Captive Insurance, Percentage of Occurance Risk Layer	100.00%
Captive Insurance, Obligation Per Occurrence	$ 250,000
Letters of Credit Outstanding, Amount	21,500,000
Increase (Decrease) in Incurred Insurance Losses and Loss Adjustment Expenses	(200,000)	$ (1,900,000)
Kimco Insurance Company [Member] \| Minimum [Member]
Captive Insurance, Annual Aggregates Per Policy	$ 7,800,000
Captive Insurance, Obligations to Reinsurance Provider, Percent of Incurred Losses	8.00%
Kimco Insurance Company [Member] \| Maximum [Member]
Captive Insurance, Annual Aggregates Per Policy	$ 13,200,000
Captive Insurance, Obligations to Reinsurance Provider, Percent of Incurred Losses	12.20%

The amount of annual aggregates for captive insurance coverage policies.

No definition available.

Name:	kim_CaptiveInsuranceAnnualAggregatesPerPolicy
Namespace Prefix:	kim_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount the company is obligated to cover per occurrence.

No definition available.

Name:	kim_CaptiveInsuranceObligationPerOccurrence
Namespace Prefix:	kim_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The percentage of incurred losses that the captive insurance company is required to pay to the reinsurance provider.

No definition available.

Name:	kim_CaptiveInsuranceObligationsToReinsuranceProviderPercentOfIncurredLosses
Namespace Prefix:	kim_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The percentage of occurrence risk layer that is assumed by the insurance company.

No definition available.

Name:	kim_CaptiveInsurancePercentageOfOccuranceRiskLayer
Namespace Prefix:	kim_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the amount of increase (decrease) in incurred insurance losses and loss adjustment expenses.

No definition available.

Name:	kim_IncreaseDecreaseInIncurredInsuranceLossesAndLossAdjustmentExpenses
Namespace Prefix:	kim_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	dei_LegalEntityAxis=kim_KimcoInsuranceCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: