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DISCONTINUED OPERATIONS AND SALES OF REAL ESTATE (Details) (USD $) | 12 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 31, 2013 | Jun. 30, 2013
DISCONTINUED OPERATIONS AND SALES OF REAL ESTATE |  |  |  |  |
Total Revenues | $ 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 193,480 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 462,031 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue |  |
Operating and other expenses | 0 nen_DisposalGroupIncludingDiscontinuedOperationOtherCostOfOperatingRevenueAndOtherExpenses | 172,322 nen_DisposalGroupIncludingDiscontinuedOperationOtherCostOfOperatingRevenueAndOtherExpenses | 348,714 nen_DisposalGroupIncludingDiscontinuedOperationOtherCostOfOperatingRevenueAndOtherExpenses |  |
Depreciation and amortization | 0 us-gaap_DepreciationAndAmortizationDiscontinuedOperations | 2,111 us-gaap_DepreciationAndAmortizationDiscontinuedOperations | 79,969 us-gaap_DepreciationAndAmortizationDiscontinuedOperations |  |
Total Expenses | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | 174,433 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | 428,683 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense |  |
Income from discontinued operations | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 19,047 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 33,348 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |  |
Gain on the sale of real estate property |  |  |  |  |
Gain on the sale of real estate |  | 3,678,839 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |
Nashoba Apartments in Acton, Massachusetts |  |  |  |  |
Gain on the sale of real estate property |  |  |  |  |
Sale price |  |  |  | 4,300,000 nen_RealEstatePropertySalesPrice / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = nen_NashobaApartmentsLPResidentialApartmentsActonMassachusettsMember | 4,300,000 nen_RealEstatePropertySalesPrice / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = nen_NashobaApartmentsLPResidentialApartmentsActonMassachusettsMember
Net book value |  |  |  |  | (476,766)us-gaap_CostOfRealEstateSales / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = nen_NashobaApartmentsLPResidentialApartmentsActonMassachusettsMember
Expense of sale |  |  |  |  | (144,395)nen_RealEstateCostRelatedToSaleOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = nen_NashobaApartmentsLPResidentialApartmentsActonMassachusettsMember
Gain on the sale of real estate |  |  |  |  | $ 3,678,839 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = nen_NashobaApartmentsLPResidentialApartmentsActonMassachusettsMember

X
- Definition Represents the amount of operating and other expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References No definition available. + Details
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- Definition Represents the amount of expense related to sale of real estate. + References No definition available. + Details
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- Definition Represents the aggregate sales price of real estate properties sold by the entity. + References No definition available. + Details
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- Definition Reflects for the period the total of the carrying amount of the commercial, industrial and residential land and buildings sold plus certain overhead and other costs incurred to place the real estate in saleable condition, capitalized interest costs in the properties sold, and inventory impairment losses recognized. This element would most likely be used by an entity whose principal activities involve real estate or which has significant real estate operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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