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OTHER ASSETS (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
OTHER ASSETS    
Security deposits $ 2,090,000us-gaap_SecurityDeposit $ 2,053,000us-gaap_SecurityDeposit
Escrow deposits to fund future capital improvements 253,000nen_EscrowDepositToFundCapitalImprovements 123,000nen_EscrowDepositToFundCapitalImprovements
Intangible assets in connection with acquisition of Hamilton Green 49,000us-gaap_FinitelivedIntangibleAssetsAcquired1 978,000us-gaap_FinitelivedIntangibleAssetsAcquired1
Accumulated amortization on intangible assets in connection with the acquisition of Windsor Green 1,703,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 774,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Financing fees, net 1,736,000nen_FinancingAndLeasingFeesNet 1,635,000nen_FinancingAndLeasingFeesNet
Accumulated amortization on financing and leasing fees $ 613,000nen_AccumulatedAmortizationOnFinancingAndLeasingFees $ 548,000nen_AccumulatedAmortizationOnFinancingAndLeasingFees