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RENTAL INCOME (Commercial Leases) (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) ft² item
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 2,671,497
Total square feet for expiring leases | ft² | 108,154
Total number of leases expiring | item | 50
Percentage of annual base rent for expiring leases | 100.00%
Through December 31, 2016 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 882,541
Total square feet for expiring leases | ft² | 52,750
Total number of leases expiring | item | 20
Percentage of annual base rent for expiring leases | 33.00%
Through December 31, 2017 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 390,984
Total square feet for expiring leases | ft² | 12,609
Total number of leases expiring | item | 6
Percentage of annual base rent for expiring leases | 15.00%
Through December 31, 2018 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 654,055
Total square feet for expiring leases | ft² | 21,839
Total number of leases expiring | item | 12
Percentage of annual base rent for expiring leases | 24.00%
Through December 31, 2019 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 150,851
Total square feet for expiring leases | ft² | 1,523
Total number of leases expiring | item | 3
Percentage of annual base rent for expiring leases | 6.00%
Through December 31, 2020 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 349,966
Total square feet for expiring leases | ft² | 12,733
Total number of leases expiring | item | 6
Percentage of annual base rent for expiring leases | 13.00%
Through December 31, 2021 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 100,650
Total square feet for expiring leases | ft² | 2,850
Total number of leases expiring | item | 2
Percentage of annual base rent for expiring leases | 4.00%
Through December 31, 2023 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 142,450
Total square feet for expiring leases | ft² | 3,850
Total number of leases expiring | item | 1
Percentage of annual base rent for expiring leases | 5.00%

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- Definition Represents the amount of annual rent to be receivable for leases to be expired. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the number of leases to be expired. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of annual base rent for leases to be expired. + References No definition available. + Details
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Namespace Prefix: | nen_
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- Definition Represents the square feet area of rental properties for which leases are to be expired. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | dtr-types:areaItemType
Balance Type: | na
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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