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TAXABLE INCOME AND TAX BASIS (Details) - 10Q (USD $) | 12 Months Ended
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Dec. 31, 2014
TAXABLE INCOME AND TAX BASIS |
Excess amount of statement income over taxable income | $ 3,100,000 nen_IncomeTaxDifferenceBetweenStatementIncomeAndTaxableIncome
Excess amount of cumulative statement basis over cumulative taxable basis | 5,000,000 nen_IncomeTaxExcessOfRealEstateStatementBasisOverRealEstateIncomeTaxBasis
Excess amount of statement income from joint venture investments over taxable income | 1,300,000 nen_IncomeTaxExcessOfInvestmentsStatementBasisOverInvestmentsTaxableBasis
Reconciliation of GAAP net income to taxable income |
Taxable loss | $ 2,100,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis

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
Name: | nen_IncomeTaxExcessOfInvestmentsStatementBasisOverInvestmentsTaxableBasis
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

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- Details
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Namespace Prefix: | nen_
Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Represents the consolidated taxable income of the entity for the period. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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