XML 36 R27.htm IDEA: XBRL DOCUMENT
v3.22.1

PARTNERS' CAPITAL (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2022
PARTNERS' CAPITAL |
Schedule of information per depositary receipt | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended |
​ | ​ | March 31, |
​ |  | 2022 |  | 2021 |
Net Income (Loss) per Depositary Receipt |  | $ | 0.09 |  | $ | (0.08) | ​
Distributions per Depositary Receipt | ​ | $ | 1.60 | ​ | $ | 0.32 | ​

X
- Definition Tabular disclosure of information related to income (loss) and distributions per depository receipt. + References No definition available. + Details
Name: | nen_ScheduleOfIncomeLossAndDistributionPerDepositoryReceiptTableTextBlock
Namespace Prefix: | nen_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_PartnersCapitalNotesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration