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TAXABLE INCOME AND TAX BASIS (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
TAXABLE INCOME AND TAX BASIS
Excess amount of taxable income over statement income		$ 530,000
Excess amount of cumulative statement basis over cumulative taxable basis		12,000,000
Excess amount of statement income from joint venture investments over taxable income	$ 1,700,000

X

- Definition

Represents the amount of difference between taxable income and statement income.

+ References

No definition available.

+ Details

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Namespace Prefix:	nen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the amount by which taxable income basis is less than statement income basis due to accelerated depreciation.

+ References

No definition available.

+ Details

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Namespace Prefix:	nen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the cumulative basis amount by which taxable income basis is less than statement income basis.

+ References

No definition available.

+ Details

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

X

- Details

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