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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows from Operating Activities      
Net income $ 1,024,850us-gaap_NetIncomeLoss $ 5,655,385us-gaap_NetIncomeLoss $ 3,633,798us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities      
Gain on the sale of equipment   (3,500)us-gaap_GainLossOnDispositionOfAssets1  
Depreciation and amortization 10,551,527us-gaap_DepreciationDepletionAndAmortization 8,377,902us-gaap_DepreciationDepletionAndAmortization 6,012,755us-gaap_DepreciationDepletionAndAmortization
Loss from investments in joint ventures 325,297us-gaap_IncomeLossFromEquityMethodInvestments 1,166,877us-gaap_IncomeLossFromEquityMethodInvestments 1,487,484us-gaap_IncomeLossFromEquityMethodInvestments
Depreciation and amortization - discontinued operations 0us-gaap_DepreciationAndAmortizationDiscontinuedOperations 2,111us-gaap_DepreciationAndAmortizationDiscontinuedOperations 79,969us-gaap_DepreciationAndAmortizationDiscontinuedOperations
Gain on the sale of rental property   (3,678,839)us-gaap_GainLossOnSaleOfPropertyPlantEquipment  
Change in operating assets and liabilities      
(Increase) in rents receivable 21,924us-gaap_IncreaseDecreaseInAccountsReceivable (21,064)us-gaap_IncreaseDecreaseInAccountsReceivable (40,831)us-gaap_IncreaseDecreaseInAccountsReceivable
(Decrease) Increase in accounts payable and accrued expense (79,378)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 816,553us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 108,246us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Decrease in real estate tax escrow 35,219nen_IncreaseDecreaseInEscrowDeposit 74,093nen_IncreaseDecreaseInEscrowDeposit (48,327)nen_IncreaseDecreaseInEscrowDeposit
(Increase) in prepaid expenses and other assets (345,132)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 443,925us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 685,772us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Increase in advance rental payments and security deposits 306,327us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits 605,696us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits 32,996us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits
Total Adjustments 10,815,784us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 7,783,754us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 8,318,065us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities 11,840,634us-gaap_NetCashProvidedByUsedInOperatingActivities 13,439,139us-gaap_NetCashProvidedByUsedInOperatingActivities 11,951,863us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows From Investing Activities      
Proceeds from unconsolidated joint ventures 3,071,902us-gaap_ProceedsFromSaleOfEquityMethodInvestments 1,288,077us-gaap_ProceedsFromSaleOfEquityMethodInvestments 1,366,383us-gaap_ProceedsFromSaleOfEquityMethodInvestments
Net proceeds from the sale of equipment   3,500us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment  
Net proceeds from sale of real estate   2,138,978us-gaap_ProceedsFromSaleOfRealEstate  
Distribution in excess of investment in unconsolidated joint ventures 272,500us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital 1,687,750us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital  
(Investment in) unconsolidated joint ventures (279,402)us-gaap_PaymentsToAcquireEquityMethodInvestments (929,327)us-gaap_PaymentsToAcquireEquityMethodInvestments (59,383)us-gaap_PaymentsToAcquireEquityMethodInvestments
Improvement of rental properties (5,604,791)us-gaap_PaymentsToAcquireAndDevelopRealEstate (4,499,924)us-gaap_PaymentsToAcquireAndDevelopRealEstate (2,360,399)us-gaap_PaymentsToAcquireAndDevelopRealEstate
Purchase of rental properties   (22,601,774)us-gaap_PaymentsToAcquireRealEstate  
Net cash (used in) investing activities (2,539,791)us-gaap_NetCashProvidedByUsedInInvestingActivities (22,912,720)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,053,399)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities      
Payment of financing costs (305,418)us-gaap_PaymentsOfFinancingCosts (971,630)us-gaap_PaymentsOfFinancingCosts (353,400)us-gaap_PaymentsOfFinancingCosts
Proceeds of mortgage notes payable 1,109,555us-gaap_ProceedsFromNotesPayable 28,268,115us-gaap_ProceedsFromNotesPayable  
Principal payments and payoffs of mortgage notes payable (3,558,493)us-gaap_RepaymentsOfSecuredDebt (5,803,159)us-gaap_RepaymentsOfSecuredDebt (1,106,091)us-gaap_RepaymentsOfSecuredDebt
Principal payments of note payable     (1,668,600)us-gaap_RepaymentsOfNotesPayable
Stock buyback (2,685,583)us-gaap_PaymentsForRepurchaseOfEquity (1,094,609)us-gaap_PaymentsForRepurchaseOfEquity (906,214)us-gaap_PaymentsForRepurchaseOfEquity
Distributions to partners (3,858,386)us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid (3,893,662)us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid (3,932,410)us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid
Net cash provided by (used in) financing activities (9,298,325)us-gaap_NetCashProvidedByUsedInFinancingActivities 16,505,055us-gaap_NetCashProvidedByUsedInFinancingActivities (7,966,715)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (Decrease) in Cash and Cash Equivalents 2,518us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 7,031,474us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,931,749us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents, at beginning of period 14,013,380us-gaap_CashAndCashEquivalentsAtCarryingValue 6,981,906us-gaap_CashAndCashEquivalentsAtCarryingValue 4,050,157us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents, at end of period $ 14,015,898us-gaap_CashAndCashEquivalentsAtCarryingValue $ 14,013,380us-gaap_CashAndCashEquivalentsAtCarryingValue $ 6,981,906us-gaap_CashAndCashEquivalentsAtCarryingValue