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RENTAL PROPERTIES - South End neighborhood (Details) - South End neighborhood of Boston, MA [Member] | Jul. 14, 2023 USD ($) ft² item
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RENTAL PROPERTIES |
Number of units | item | 52
Number of buildings | item | 3
Area Of Building | ft² | 3,400
Purchase price of real estate properties | $ 27,500,000
Closing Costs | 81,000
Purchase price allocated to the value of the in-place leases | 525,000
Purchase price allocated to the value of the tenant relationships | 61,000
Purchase price allocated to the value of below market leases | $ 241,000
Amortization period of value of the in-place leases | 12 months
Amortization period of value of the tenant relationships | 36 months

X
- Definition Area of a building. + References No definition available. + Details
Name: | nen_AreaOfBuilding
Namespace Prefix: | nen_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the closing costs associated with the transaction. + References No definition available. + Details
Name: | nen_ClosingCosts
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of buildings. + References No definition available. + Details
Name: | nen_NumberOfBuildings
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amortization period of value of the in-place leases. + References No definition available. + Details
Name: | nen_RealEstatePropertyLeaseAmortizationTerm
Namespace Prefix: | nen_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the aggregate purchase price of real estate properties acquired by the entity. + References No definition available. + Details
Name: | nen_RealEstatePropertyPurchasePrice
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the aggregate purchase price of real estate properties acquired by the entity allocated to below-market leases. + References No definition available. + Details
Name: | nen_RealEstatePropertyPurchasePriceAllocationBelowMarketLeases
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the aggregate purchase price of real estate properties acquired by the entity allocated to leases. + References No definition available. + Details
Name: | nen_RealEstatePropertyPurchasePriceAllocationLease
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the aggregate purchase price of real estate properties acquired by the entity allocated to tenant relationships. + References No definition available. + Details
Name: | nen_RealEstatePropertyPurchasePriceAllocationTenantRelationships
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amortization period of value of the tenant relationships. + References No definition available. + Details
Name: | nen_RealEstatePropertyTenantRelationshipsAmortizationTerm
Namespace Prefix: | nen_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=nen_SouthEndNeighborhoodOfBostonMaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |