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OTHER ASSETS (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
OTHER ASSETS
Security deposits	$ 1,935,000	$ 1,919,000
Escrow deposits to fund future capital improvements	101,000	420,000
Financing fees, net	1,240,000	1,136,000
Accumulated amortization on financing and leasing fees	$ 741,000	$ 772,000

X

- Definition

Represents the accumulated amortization on financing and leasing fees.

+ References

No definition available.

+ Details

Name:	nen_AccumulatedAmortizationOnFinancingAndLeasingFees
Namespace Prefix:	nen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Restricted cash held in escrow to fund future capital improvements.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the financing and leasing fees, net of accumulated amortization.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_SecurityDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant