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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details 4) - 10Q (USD $)
Mar. 31, 2015
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES  
03/31/2016 $ 285,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths
03/31/2017 1,439,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo
03/31/2018 1,801,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree
03/31/2019 7,880,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour
03/31/2020 1,963,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive
Thereafter 182,671,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive
Total 196,039,000us-gaap_LongTermDebt
Weighted average interest rate (as a percent) 5.27%us-gaap_LongtermDebtWeightedAverageInterestRate
Effective interest rate (as a percent) 5.36%us-gaap_DebtInstrumentInterestRateEffectivePercentage
Hamilton Essex 81  
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES  
03/31/2016 145,622us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonEssex81LLCMember
03/31/2017 7,930,059us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonEssex81LLCMember
Total 8,075,681us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonEssex81LLCMember
Hamilton Essex 81 Development  
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES  
03/31/2016 1,974,501us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonEssex81DevelopmentLLCMember
Total 1,974,501us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonEssex81DevelopmentLLCMember
345 Franklin  
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES  
03/31/2017 131,657us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_Franklin345LLCMember
03/31/2018 185,410us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_Franklin345LLCMember
03/31/2019 192,714us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_Franklin345LLCMember
03/31/2020 200,305us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_Franklin345LLCMember
Thereafter 9,289,914us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_Franklin345LLCMember
Total 10,000,000us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_Franklin345LLCMember
Hamilton 1025  
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES  
03/31/2016 73,013us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_Hamilton1025LLCMember
03/31/2017 4,714,302us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_Hamilton1025LLCMember
Total 4,787,315us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_Hamilton1025LLCMember
Hamilton Bay Apartments  
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES  
03/31/2016 75,910us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonBayApartmentsLLCMember
03/31/2017 78,894us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonBayApartmentsLLCMember
03/31/2018 4,401,271us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonBayApartmentsLLCMember
Total 4,556,075us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonBayApartmentsLLCMember
Hamilton Minuteman  
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES  
03/31/2016 79,962us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonMinutemanLLCMember
03/31/2017 5,192,036us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonMinutemanLLCMember
Total 5,271,998us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonMinutemanLLCMember
Hamilton on Main Apts  
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES  
Thereafter 16,900,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonOnMainLLCMember
Total 16,900,000us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonOnMainLLCMember
Dexter Park  
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES  
03/31/2016 1,439,081us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonParkTowersLLCMember
03/31/2017 1,521,316us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonParkTowersLLCMember
03/31/2018 1,608,251us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonParkTowersLLCMember
03/31/2019 1,700,153us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonParkTowersLLCMember
03/31/2020 79,628,122us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonParkTowersLLCMember
Total 85,896,923us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nen_HamiltonParkTowersLLCMember
Total  
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES  
03/31/2016 3,788,089us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvestmentsMember
03/31/2017 19,568,264us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvestmentsMember
03/31/2018 6,194,932us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvestmentsMember
03/31/2019 1,892,867us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvestmentsMember
03/31/2020 79,828,427us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvestmentsMember
Thereafter 26,189,914us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvestmentsMember
Total $ 137,462,493us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvestmentsMember