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RENTAL INCOME (Commercial Leases) (Details) | 3 Months Ended
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Mar. 31, 2018 USD ($) ft² item
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 2,988,883
Total square feet for expiring leases | ft² | 108,043
Total number of leases expiring | item | 46
Percentage of annual base rent for expiring leases | 100.00%
Through December 31, 2019 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 431,751
Total square feet for expiring leases | ft² | 16,542
Total number of leases expiring | item | 12
Percentage of annual base rent for expiring leases | 14.00%
Through December 31, 2020 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 458,122
Total square feet for expiring leases | ft² | 17,135
Total number of leases expiring | item | 10
Percentage of annual base rent for expiring leases | 15.00%
Through December 31, 2021 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 193,519
Total square feet for expiring leases | ft² | 4,170
Total number of leases expiring | item | 6
Percentage of annual base rent for expiring leases | 6.00%
Through December 31, 2022 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 1,137,030
Total square feet for expiring leases | ft² | 47,591
Total number of leases expiring | item | 9
Percentage of annual base rent for expiring leases | 39.00%
Through December 31, 2023 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 246,341
Total square feet for expiring leases | ft² | 7,087
Total number of leases expiring | item | 4
Percentage of annual base rent for expiring leases | 8.00%
Through December 31, 2024 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 379,670
Total square feet for expiring leases | ft² | 11,668
Total number of leases expiring | item | 4
Percentage of annual base rent for expiring leases | 13.00%
Through December 31, 2029 |
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: | num:areaItemType
Balance Type: | na
Period Type: | duration

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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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