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RENTAL INCOME (Rent Receivable) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
RENTAL INCOME
Allowance for doubtful rent receivable	$ 605,000	$ 644,000
Recognizing rental income from non-cancelable commercial leases with future rental increases on a straight-line basis	114,000
Deferred rental concession	$ 120,000

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