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RENTAL INCOME (Rent Receivable) (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
RENTAL INCOME |  |
Allowance for doubtful rent receivable | $ 1,271,000 | $ 1,454,000
Recognizing rental income from non-cancelable commercial leases with future rental increases on a straight-line basis | 84,000 |
Deferred rental concession | $ 427,000 |

X
- Definition Represents the amount of allowance for doubtful accounts related to rents receivable. + References No definition available. + Details
Name: | nen_OperatingLeasesAllowanceForDoubtfulRentReceivable
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the deferred rental concessions on real estate properties. + References No definition available. + Details
Name: | nen_OperatingLeasesDeferralOfRentalConcession
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount resulting from recognizing rental income from non-cancelable commercial leases with future rental increases on a straight-line basis, which is included in rents receivable. + References No definition available. + Details
Name: | nen_OperatingLeasesRentalIncomeWithFutureRentalIncreases
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration