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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details 3) - 10Q (USD $) | 3 Months Ended |  |  |  |  |  |
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Mar. 31, 2015 | Mar. 31, 2014 | Nov. 30, 2001 | Mar. 02, 2005 | Oct. 03, 2005 | Sep. 30, 2004 | Aug. 31, 2004 | Oct. 28, 2009
Hamilton Essex 81 |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Rental income | $ 358,551 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | $ 328,770 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Laundry and sundry income | 3,842 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 3,920 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Total Revenues | 362,393 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 332,690 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Administrative | 3,936 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 3,178 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Depreciation and amortization | 111,469 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 107,903 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Management fee | 15,345 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 13,275 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Operating | 37,532 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 44,972 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Renting | 500 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 117 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Repairs and maintenance | 25,683 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 32,278 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Taxes and insurance | 53,418 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 58,284 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Total Expenses | 247,883 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 260,008 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Income Before Other Income | 114,510 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 72,682 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Interest expense | 118,233 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 119,368 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Total Other Income (loss) | (118,233)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | (119,368)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Net Income (Loss) | (3,723)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | (46,687)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Proportionate share of net income (loss) | (1,862)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | (23,343)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssex81LLCMember |  |  |  |  |  |
Hamilton Essex Development |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Rental income | 72,523 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 73,236 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Total Revenues | 72,523 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 73,236 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Administrative | 583 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 317 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Depreciation and amortization | 2,822 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 2,822 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Management fee | 2,901 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 2,929 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Taxes and insurance | 13,421 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 13,569 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Total Expenses | 19,727 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 19,638 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Income Before Other Income | 52,796 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 53,598 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Interest expense | 13,552 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 13,919 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Total Other Income (loss) | (13,552)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | (13,919)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Net Income (Loss) | 39,244 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 39,679 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Proportionate share of net income (loss) | 19,622 nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 19,840 nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonEssexDevelopmentLLCMember |  |  |  |  |  |
345 Franklin |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Rental income | 335,475 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 327,740 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Laundry and sundry income | 323 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | (423)nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Total Revenues | 335,798 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 327,317 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Administrative | 7,761 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 6,823 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Depreciation and amortization | 93,793 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 99,725 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Management fee | 14,108 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 13,666 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Operating | 40,071 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 24,823 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Renting | 6,345 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 3,443 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Repairs and maintenance | 5,988 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 12,337 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Taxes and insurance | 29,937 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 29,644 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Total Expenses | 198,003 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 190,461 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Income Before Other Income | 137,795 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 136,856 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Interest expense | 97,936 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 97,753 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Total Other Income (loss) | (97,936)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | (97,753)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Net Income (Loss) | 39,859 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 39,104 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Proportionate share of net income (loss) | 19,929 nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 19,552 nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |  |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Franklin345LLCMember |  |  |  |  |
Hamilton 1025 |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Rental income | 240,400 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 231,187 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Total Revenues | 240,400 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 231,187 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Administrative | 1,992 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 1,968 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Depreciation and amortization | 60,029 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 60,152 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Management fee | 9,439 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 9,231 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Operating | 125 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 160 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Renting |  | 5,753 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Repairs and maintenance | 76,497 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 80,443 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Taxes and insurance | 43,051 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 40,604 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Total Expenses | 191,133 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 198,311 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Income Before Other Income | 49,267 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 32,876 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Interest expense | 68,488 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 69,560 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Interest Income | 6 nen_EquityMethodInvestmentSummarizedFinancialInformationInvestmentIncomeInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 4 nen_EquityMethodInvestmentSummarizedFinancialInformationInvestmentIncomeInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Total Other Income (loss) | (68,482)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | (69,555)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Net Income (Loss) | (19,215)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | (36,679)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Proportionate share of net income (loss) | (9,608)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | (18,340)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |  |  |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_Hamilton1025LLCMember |  |  |  |
Hamilton Bay Sales |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Rental income | 29,295 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 62,798 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Total Revenues | 29,295 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 62,798 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Administrative | 2,779 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 705 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Depreciation and amortization | 8,987 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 19,175 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Management fee | 1,274 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 2,384 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Operating | 24 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 251 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Renting | (459)nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 753 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Repairs and maintenance | 11,944 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 23,824 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Taxes and insurance | 5,881 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 11,899 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Total Expenses | 30,430 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 58,990 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Income Before Other Income | (1,135)nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 3,808 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Interest expense | 110 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 195 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Interest Income from Note |  | 334 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestIncomeOther / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Gain on Sale of Real Estate |  | 52,283 nen_EquityMethodInvestmentSummarizedFinancialInformationDiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Other Income (Expenses) | (125)nen_EquityMethodInvestmentSummarizedFinancialInformationInvestmentOtherIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |  |
Total Other Income (loss) | (235)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 52,422 nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Net Income (Loss) | (1,370)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 56,230 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Proportionate share of net income (loss) | (685)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 28,115 nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayLLCMember |  |  |  |  |  |
Hamilton Bay Apartments |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Rental income | 250,573 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 238,891 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Total Revenues | 250,573 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 238,891 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Administrative | 1,814 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 4,845 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Depreciation and amortization | 79,328 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 79,314 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Management fee | 9,495 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 9,460 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Operating | 665 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 459 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Renting | 2,350 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 3,492 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Repairs and maintenance | 84,858 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 73,437 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Taxes and insurance | 37,830 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 40,759 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Total Expenses | 216,340 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 211,766 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Income Before Other Income | 34,233 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 27,125 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Interest expense | 64,464 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 65,465 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Total Other Income (loss) | (64,464)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | (65,465)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Net Income (Loss) | (30,231)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | (38,340)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Proportionate share of net income (loss) | (15,116)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | (19,170)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |
Hamilton Minuteman |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Rental income | 233,897 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 223,942 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Laundry and sundry income |  | 169 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Total Revenues | 233,897 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 224,111 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Administrative | 1,624 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 3,003 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Depreciation and amortization | 81,518 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 79,402 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Management fee | 9,825 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 9,310 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Operating | 32,547 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 32,854 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Renting | 3,742 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 2,466 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Repairs and maintenance | 15,124 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 16,887 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Taxes and insurance | 30,958 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 29,572 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Total Expenses | 175,338 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 173,493 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Income Before Other Income | 58,559 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 50,619 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Interest expense | 75,491 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 76,500 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Total Other Income (loss) | (75,491)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | (76,500)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Net Income (Loss) | (16,932)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | (25,881)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Proportionate share of net income (loss) | (8,466)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | (12,941)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  |  |  |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonMinutemanLLCMember |  |
Hamilton on Main Apts |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Rental income | 761,273 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 717,680 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Laundry and sundry income | 10,641 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 9,456 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Total Revenues | 771,914 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 727,136 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Administrative | 9,276 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 9,485 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Depreciation and amortization | 240,762 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 236,015 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Management fee | 30,080 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 28,263 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Operating | 138,255 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 142,160 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Renting | 1,766 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 6,829 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Repairs and maintenance | 84,161 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 90,518 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Taxes and insurance | 83,506 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 95,639 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Total Expenses | 587,806 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 608,908 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Income Before Other Income | 184,108 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 118,227 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Interest expense | 185,810 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 200,379 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Total Other Income (loss) | (185,810)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | (200,379)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Net Income (Loss) | (1,702)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | (82,152)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Proportionate share of net income (loss) | (851)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | (41,076)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  |  |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonOnMainLLCMember |
Dexter Park |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Rental income | 3,488,805 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 3,357,055 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Laundry and sundry income | 19,245 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 25,380 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Total Revenues | 3,508,050 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 3,382,434 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Administrative | 52,330 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 54,543 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Depreciation and amortization | 814,969 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 1,345,463 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Management fee | 74,951 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 71,898 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Operating | 455,656 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 488,785 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Renting | 16,293 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 18,590 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Repairs and maintenance | 216,618 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 196,494 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Taxes and insurance | 361,255 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 381,185 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Total Expenses | 1,992,072 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 2,556,958 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Income Before Other Income | 1,515,978 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 825,476 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Interest expense | 1,210,300 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 1,227,695 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Total Other Income (loss) | (1,210,300)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | (1,227,695)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Net Income (Loss) | 305,678 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | (402,219)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Proportionate share of net income (loss) | 122,271 nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | (160,888)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  |
Percentage of ownership interest | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember |  |  |  |  |  | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonParkTowersLLCMember
Total |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Rental income | 5,770,792 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 5,561,299 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Laundry and sundry income | 34,051 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 38,501 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Total Revenues | 5,804,843 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 5,599,800 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Administrative | 82,095 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 84,868 nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Depreciation and amortization | 1,493,677 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 2,029,971 nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Management fee | 167,418 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 160,417 nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Operating | 704,875 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 734,463 nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Renting | 30,537 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 41,441 nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Repairs and maintenance | 520,873 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 526,219 nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Taxes and insurance | 659,257 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 701,154 nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Total Expenses | 3,658,732 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 4,278,532 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Income Before Other Income | 2,146,111 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 1,321,267 nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Interest expense | 1,834,384 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 1,870,833 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Interest Income | 6 nen_EquityMethodInvestmentSummarizedFinancialInformationInvestmentIncomeInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 4 nen_EquityMethodInvestmentSummarizedFinancialInformationInvestmentIncomeInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Interest Income from Note |  | 334 nen_EquityMethodInvestmentSummarizedFinancialInformationInterestIncomeOther / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Gain on Sale of Real Estate |  | 52,283 nen_EquityMethodInvestmentSummarizedFinancialInformationDiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Other Income (Expenses) | (125)nen_EquityMethodInvestmentSummarizedFinancialInformationInvestmentOtherIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |  |
Total Other Income (loss) | (1,834,503)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | (1,818,212)nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Net Income (Loss) | 311,608 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | (496,945)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Proportionate share of net income (loss) | 125,234 nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | (208,250)nen_NetIncomeLossProportionateShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Total | NERA 50% |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | 2,963 nen_NetIncomeLossProportionateShare / nen_PartnershipOwnershipAxis = nen_NewEnglandRealtyAssociatesLimitedPartnership50PercentOwnershipMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | (47,363)nen_NetIncomeLossProportionateShare / nen_PartnershipOwnershipAxis = nen_NewEnglandRealtyAssociatesLimitedPartnership50PercentOwnershipMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |
Total | NERA 40% |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | $ 122,271 nen_NetIncomeLossProportionateShare / nen_PartnershipOwnershipAxis = nen_NewEnglandRealtyAssociatesLimitedPartnership40PercentOwnershipMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | $ (160,888)nen_NetIncomeLossProportionateShare / nen_PartnershipOwnershipAxis = nen_NewEnglandRealtyAssociatesLimitedPartnership40PercentOwnershipMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |  |  |  |

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