Label	Element	Value
Hamilton Bay L L C [Member] \| Residential Apartment [Member]
Number of Units in Real Estate Property Unsold	nen_NumberOfUnitsInRealEstatePropertyUnsold	1

Represents the number of units unsold by the entity.

No definition available.

Name:	nen_NumberOfUnitsInRealEstatePropertyUnsold
Namespace Prefix:	nen_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant