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RENTAL INCOME (Details 2) - 10Q (Commercial rental income, Staples and Trader Joes)
3 Months Ended
Mar. 31, 2015
Commercial rental income | Staples and Trader Joes
 
Concentration Risk [Line Items]  
Concentration risk percentage 26.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= nen_CommercialRentalIncomeMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember