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Commitments and Contingencies (Details) | Jun. 30, 2015 USD ($) | Jun. 09, 2015 property
--- | --- | ---
Loss Contingencies [Line Items] |  |
Insurance recovery receivable | $ | $ 952,084 |
Westgate Apartments LLC |  |
Loss Contingencies [Line Items] |  |
Number of properties |  | 12
Number of apartments damaged |  | 10
Insurance recovery receivable | $ | $ 952,000 |

X
- Definition Number of real estate properties damaged. + References No definition available. + Details
Name: | nen_NumberOfRealEstatePropertiesDamaged
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
Name: | us-gaap_InsuranceSettlementsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_WestgateApartmentsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |