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RELATED PARTY TRANSACTIONS (Details) - 10Q (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2015 item | Mar. 31, 2014
RELATED PARTY TRANSACTIONS |  |
Management fee as percentage of gross receipts rental revenue | 4.00%nen_RelatedPartyTransactionManagementFeeAsPercentageOfPropertyRentalRevenueAndLaundryIncome |
Management fee as a percentage of gross receipts rental revenue of Linewt, LLC | 3.00%nen_RelatedPartyTransactionManagementFeeAsPercentageOfLinewt |
Management fees of related party | $ 451,000 nen_RelatedPartyTransactionManagementFee | $ 427,000 nen_RelatedPartyTransactionManagementFee
Repairs and maintenance | 1,347,214 us-gaap_CostOfPropertyRepairsAndMaintenance | 1,211,254 us-gaap_CostOfPropertyRepairsAndMaintenance
Administrative expense | 533,077 us-gaap_GeneralAndAdministrativeExpense | 530,567 us-gaap_GeneralAndAdministrativeExpense
Management fee | 450,704 nen_ManagementFees | 427,392 nen_ManagementFees
Number of limited partnerships and limited liability companies in which the entity has invested | 9 nen_InvestmentsInNumberOfLimitedPartnershipsAndLimitedLiabilityCompanies |
Limited Partnerships | Minimum |  |
RELATED PARTY TRANSACTIONS |  |
Percentage of ownership interest | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_LimitedPartnershipsMember |
Limited Partnerships | Maximum |  |
RELATED PARTY TRANSACTIONS |  |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_LimitedPartnershipsMember |
General Partner or Management Company |  |
RELATED PARTY TRANSACTIONS |  |
Costs related to professional services | 238,000 us-gaap_ProfessionalFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_GeneralPartnerOrManagementCompanyMember | 178,000 us-gaap_ProfessionalFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_GeneralPartnerOrManagementCompanyMember
Repairs and maintenance | 124,000 us-gaap_CostOfPropertyRepairsAndMaintenance / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_GeneralPartnerOrManagementCompanyMember |
Administrative expense | 84,000 us-gaap_GeneralAndAdministrativeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_GeneralPartnerOrManagementCompanyMember |
Expenses for construction, architectural services and supervision of capital projects | 30,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_GeneralPartnerOrManagementCompanyMember |
Management Company |  |
RELATED PARTY TRANSACTIONS |  |
Reimbursement to related party for payroll transfers | 729,000 nen_RelatedPartyTransactionReimbursementToRelatedPartyForEmployeePayroll / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_ManagementCompanyMember | 866,000 nen_RelatedPartyTransactionReimbursementToRelatedPartyForEmployeePayroll / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_ManagementCompanyMember
Employer contributions in 401K plan | 0 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_ManagementCompanyMember | 0 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_ManagementCompanyMember
Number of accounting staff of related party providing bookkeeping and accounting functions | 14 nen_RelatedPartyTransactionNumberOfAccountingStaff / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_ManagementCompanyMember |
Fees for accounting and bookkeeping services | 31,250 nen_RelatedPartyTransactionBookkeepingAndAccountingServicesFee / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_ManagementCompanyMember | 31,250 nen_RelatedPartyTransactionBookkeepingAndAccountingServicesFee / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_ManagementCompanyMember
Fees for accounting and bookkeeping services per year | 125,000 nen_RelatedPartyTransactionBookkeepingAndAccountingServicesFeePerYear / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_ManagementCompanyMember |
Number of employees having ownership interest in the investment properties | 6 nen_NumberOfEmployeesHavingOwnershipInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_ManagementCompanyMember |
Dexter Park |  |
RELATED PARTY TRANSACTIONS |  |
Management fee as percentage of gross receipts rental revenue | 2.00%nen_RelatedPartyTransactionManagementFeeAsPercentageOfPropertyRentalRevenueAndLaundryIncome / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_HamiltonParkTowersLLCMember |
President of Management Company |  |
RELATED PARTY TRANSACTIONS |  |
Quarterly fee for asset management consulting services | 18,750 nen_AssetManagementQuarterlyFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_PresidentOfManagementCompanyMember | 18,750 nen_AssetManagementQuarterlyFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_PresidentOfManagementCompanyMember
Harold Brown | Minimum |  |
RELATED PARTY TRANSACTIONS |  |
Percentage of ownership interest | 43.20%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_HaroldBrownMember |
Harold Brown | Maximum |  |
RELATED PARTY TRANSACTIONS |  |
Percentage of ownership interest | 57.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nen_HaroldBrownMember |
Partially owned properties |  |
RELATED PARTY TRANSACTIONS |  |
Management fee as percentage of gross receipts rental revenue | 4.00%nen_RelatedPartyTransactionManagementFeeAsPercentageOfPropertyRentalRevenueAndLaundryIncome / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember |
Repairs and maintenance | 47,000 us-gaap_CostOfPropertyRepairsAndMaintenance / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember |
Administrative expense | 6,000 us-gaap_GeneralAndAdministrativeExpense / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember |
Expenses for construction, architectural services and supervision of capital projects | 5,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember |
Amount paid to related party | 225,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember |
Management fee | $ 167,000 nen_ManagementFees / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember |

X
- Definition Represents the amount of quarterly fee for asset management consulting services. + References No definition available. + Details
Name: | nen_AssetManagementQuarterlyFees
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of limited partnerships and limited liability companies in which the entity has made investments. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the amount of management fee incurred for payment to a management company during the reporting period. + References No definition available. + Details
Name: | nen_ManagementFees
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of employees other than the President having an ownership interest. + References No definition available. + Details
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- Definition Represents the amount charged for bookkeeping and accounting services as included in administrative expenses. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount charged for bookkeeping and accounting services per year as included in administrative expenses. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the charge against earnings towards management fees associate with the services provided by related party. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the management fees expressed as a percentage of Linewt. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the management fee expressed as a percentage of rental revenues from properties owned. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of employees who perform accounting and bookkeeping functions. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount reimbursed to related party for transfer of employee payroll. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. + 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.2(a),(b),(c),(d)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section 45 -Paragraph 3 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6488370&loc=d3e13550-115849 + Details
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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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