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ADVANCE RENTAL PAYMENTS AND SECURITY DEPOSITS (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
ADVANCE RENTAL PAYMENTS AND SECURITY DEPOSITS |  |
Period for advance rental payment | 1 month |
Amount received for prepaid rent | $ 2,255,000 | $ 2,127,000
Security deposits | $ 2,571,000 | $ 2,420,000

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- References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period for which tenant may be required to pay rent in advance. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Represents amounts received from tenants for prepaid rents which are included in cash and cash equivalents. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of security deposits included in other assets and are classified as restricted cash. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant