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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details) | 6 Months Ended
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Jun. 30, 2022 item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |
Number of limited partnerships and limited liability companies in which the entity has invested | 7
Investment Properties |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |
Number of limited partnerships and limited liability companies in which the entity has invested | 7
Number of partnerships investing in commercial property | 3
Hamilton Company/Management Company |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |
Number of employees having ownership interest in the investment properties | 5
Management Company [Member] |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |
Number of employees having ownership interest in the investment properties | 5

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- Definition Represents the number of limited partnerships and limited liability companies in which the entity has made investments which are accounted for using the equity method of consolidation. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of employees, excluding President, having ownership interest in the investment properties. + References No definition available. + Details
Name: | nen_NumberOfEmployeesHavingOwnershipInterest
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of partnerships which are investing in commercial properties. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
Name: | dei_LegalEntityAxis=nen_HamiltonCompanyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nen_ManagementCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |