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CONSOLIDATED STATEMENTS OF INCOME (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues      
Rental income $ 42,205,644us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 37,961,599us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 34,784,130us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Laundry and sundry income 426,675us-gaap_OtherRealEstateRevenue 402,953us-gaap_OtherRealEstateRevenue 385,040us-gaap_OtherRealEstateRevenue
Total Revenues 42,632,319us-gaap_Revenues 38,364,552us-gaap_Revenues 35,169,170us-gaap_Revenues
Expenses      
Administrative 2,206,483us-gaap_GeneralAndAdministrativeExpense 2,116,527us-gaap_GeneralAndAdministrativeExpense 1,813,150us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization 10,551,527us-gaap_DepreciationDepletionAndAmortization 8,377,902us-gaap_DepreciationDepletionAndAmortization 6,012,755us-gaap_DepreciationDepletionAndAmortization
Management fee 1,744,849nen_ManagementFees 1,570,158nen_ManagementFees 1,428,052nen_ManagementFees
Operating 4,668,196us-gaap_OtherCostOfOperatingRevenue 4,201,928us-gaap_OtherCostOfOperatingRevenue 3,580,690us-gaap_OtherCostOfOperatingRevenue
Renting 430,949us-gaap_LeaseAndRentalExpense 202,787us-gaap_LeaseAndRentalExpense 180,574us-gaap_LeaseAndRentalExpense
Repairs and maintenance 6,608,290us-gaap_CostOfPropertyRepairsAndMaintenance 5,815,264us-gaap_CostOfPropertyRepairsAndMaintenance 5,075,037us-gaap_CostOfPropertyRepairsAndMaintenance
Taxes and insurance 5,519,432us-gaap_RealEstateTaxesAndInsurance 4,948,569us-gaap_RealEstateTaxesAndInsurance 4,299,169us-gaap_RealEstateTaxesAndInsurance
Total Expenses 31,729,726us-gaap_OperatingExpenses 27,233,135us-gaap_OperatingExpenses 22,389,427us-gaap_OperatingExpenses
Income Before Other Income 10,902,593us-gaap_OperatingIncomeLoss 11,131,417us-gaap_OperatingIncomeLoss 12,779,743us-gaap_OperatingIncomeLoss
Other Income (Expense)      
Interest income 754us-gaap_InvestmentIncomeInterest 1,118us-gaap_InvestmentIncomeInterest 2,216us-gaap_InvestmentIncomeInterest
Interest expense (9,553,200)us-gaap_InterestExpense (8,013,109)us-gaap_InterestExpense (7,695,232)us-gaap_InterestExpense
(Loss) from investments in unconsolidated joint ventures (325,297)us-gaap_IncomeLossFromEquityMethodInvestments (1,166,877)us-gaap_IncomeLossFromEquityMethodInvestments (1,487,484)us-gaap_IncomeLossFromEquityMethodInvestments
Other income   4,950us-gaap_OtherNonoperatingGainsLosses 1,207us-gaap_OtherNonoperatingGainsLosses
Total Other Income (loss) (9,877,743)us-gaap_NonoperatingIncomeExpense (9,173,918)us-gaap_NonoperatingIncomeExpense (9,179,293)us-gaap_NonoperatingIncomeExpense
Income (loss) From Continuing Operations 1,024,850us-gaap_IncomeLossFromContinuingOperations 1,957,499us-gaap_IncomeLossFromContinuingOperations 3,600,450us-gaap_IncomeLossFromContinuingOperations
Discontinued Operations      
Income from discontinued operations 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 19,047us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 33,348us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Gain on the sale of real estate   3,678,839us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax  
Total Discontinued Operations   3,697,886us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 33,348us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net Income (Loss) $ 1,024,850us-gaap_NetIncomeLoss $ 5,655,385us-gaap_NetIncomeLoss $ 3,633,798us-gaap_NetIncomeLoss
Income (loss) per Unit      
Income (loss) before discontinued operations $ 7.96us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 15.07us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 27.44us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Income (Loss) from discontinued operations $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic $ 28.48us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic $ 0.25us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic
Net Income (loss) per Unit $ 7.96us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 43.55us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 27.69us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Weighted Average Number of Units Outstanding (in units) 128,735us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding 129,868us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding 131,230us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding