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RENTAL PROPERTIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Rental properties
Total fixed assets	$ 225,021,946us-gaap_RealEstateInvestmentPropertyAtCost	$ 221,454,286us-gaap_RealEstateInvestmentPropertyAtCost
Less: Accumulated depreciation	(75,905,862)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation	(68,549,625)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Total fixed assets, net	149,116,084us-gaap_RealEstateInvestmentPropertyNet	152,904,661us-gaap_RealEstateInvestmentPropertyNet
Land, improvements and parking lots
Rental properties
Total fixed assets	44,541,471us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_LandAndLandImprovementsAndParkingLotMember	43,919,728us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_LandAndLandImprovementsAndParkingLotMember
Land, improvements and parking lots | Minimum
Rental properties
Useful Life	15 years
Land, improvements and parking lots | Maximum
Rental properties
Useful Life	40 years
Buildings and Improvements
Rental properties
Total fixed assets	153,059,430us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_BuildingAndBuildingImprovementsMember	152,130,635us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_BuildingAndBuildingImprovementsMember
Buildings and Improvements | Minimum
Rental properties
Useful Life	15 years
Buildings and Improvements | Maximum
Rental properties
Useful Life	40 years
Kitchen cabinets
Rental properties
Total fixed assets	6,865,348us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_KitchenCabinetsMember	5,956,078us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_KitchenCabinetsMember
Kitchen cabinets | Minimum
Rental properties
Useful Life	5 years
Kitchen cabinets | Maximum
Rental properties
Useful Life	10 years
Carpets
Rental properties
Total fixed assets	6,341,227us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_CarpetsMember	5,820,516us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_CarpetsMember
Carpets | Minimum
Rental properties
Useful Life	5 years
Carpets | Maximum
Rental properties
Useful Life	10 years
Air conditioning
Rental properties
Total fixed assets	705,116us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_AirConditioningMember	707,928us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_AirConditioningMember
Air conditioning | Minimum
Rental properties
Useful Life	5 years
Air conditioning | Maximum
Rental properties
Useful Life	10 years
Laundry equipment
Rental properties
Total fixed assets	147,721us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_LaundryEquipmentMember	404,775us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_LaundryEquipmentMember
Laundry equipment | Minimum
Rental properties
Useful Life	5 years
Laundry equipment | Maximum
Rental properties
Useful Life	7 years
Elevators
Rental properties
Total fixed assets	1,139,296us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_ElevatorMember	1,139,296us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_ElevatorMember
Elevators | Minimum
Rental properties
Useful Life	20 years
Elevators | Maximum
Rental properties
Useful Life	40 years
Swimming pools
Rental properties
Total fixed assets	444,629us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_SwimmingPoolMember	444,629us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_SwimmingPoolMember
Swimming pools | Minimum
Rental properties
Useful Life	10 years
Swimming pools | Maximum
Rental properties
Useful Life	30 years
Equipment
Rental properties
Total fixed assets	5,491,992us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_EquipmentMember	5,038,530us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_EquipmentMember
Equipment | Minimum
Rental properties
Useful Life	5 years
Equipment | Maximum
Rental properties
Useful Life	7 years
Motor vehicles
Rental properties
Total fixed assets	130,563us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_VehiclesMember	86,657us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_VehiclesMember
Useful Life	5 years
Fences
Rental properties
Total fixed assets	24,670us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_FenceMember	24,670us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_FenceMember
Fences | Minimum
Rental properties
Useful Life	5 years
Fences | Maximum
Rental properties
Useful Life	15 years
Furniture and fixtures
Rental properties
Total fixed assets	5,910,046us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_FurnitureAndFixturesMember	5,564,621us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_FurnitureAndFixturesMember
Furniture and fixtures | Minimum
Rental properties
Useful Life	5 years
Furniture and fixtures | Maximum
Rental properties
Useful Life	7 years
Smoke alarms
Rental properties
Total fixed assets	$ 220,437us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_SmokeAlarmMember	$ 216,223us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nen_SmokeAlarmMember
Smoke alarms | Minimum
Rental properties
Useful Life	5 years
Smoke alarms | Maximum
Rental properties
Useful Life	7 years
Residential and mixed-use properties
RENTAL PROPERTIES
Number of units	2,412us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember
Number of properties	20us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember
Residential and mixed-use properties | Partially owned properties
RENTAL PROPERTIES
Number of units	790us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember
Number of properties	9us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember
Residential and mixed-use properties | Partially owned properties | Minimum
RENTAL PROPERTIES
Percentage of ownership interest	40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember
Residential and mixed-use properties | Partially owned properties | Maximum
RENTAL PROPERTIES
Percentage of ownership interest	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember

X

- Definition

Represents the useful life of constituents of rental properties.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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The number of real estate properties owned as of the balance sheet date.

+ References

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+ References

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- Definition

The cumulative amount of depreciation for real estate property held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(3))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 7

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

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-Subparagraph (SX 210.7-03.1(d))

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 944

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