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ADVANCE RENTAL PAYMENTS AND SECURITY DEPOSITS (Details)	9 Months Ended
	Sep. 30, 2022 USD ($)
ADVANCE RENTAL PAYMENTS AND SECURITY DEPOSITS
Period for advance rental payment	1 month
Amount received for prepaid rent	$ 2,581,000
Security deposits	$ 3,402,000

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- References

No definition available.

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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.

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No definition available.

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Namespace Prefix:	nen_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents amounts received from tenants for prepaid rents which are included in cash and cash equivalents.

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No definition available.

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Name:	nen_PrepaidRentReceivedIncludedInCashAndCashEquivalents
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.

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No definition available.

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Name:	nen_SecurityDepositIncludedInRestrictedCash
Namespace Prefix:	nen_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant