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RENTAL INCOME (Commercial Leases) (Details) | 6 Months Ended
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Jun. 30, 2019 USD ($) ft² item
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 2,925,852
Total square feet for expiring leases | ft² | 106,683
Total number of leases expiring | item | 45
Percentage of annual base rent for expiring leases | 100.00%
Through March 31, 2020 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 164,818
Total square feet for expiring leases | ft² | 9,262
Total number of leases expiring | item | 8
Percentage of annual base rent for expiring leases | 6.00%
Through March 31, 2021 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 747,156
Total square feet for expiring leases | ft² | 28,897
Total number of leases expiring | item | 9
Percentage of annual base rent for expiring leases | 25.00%
Through March 31, 2022 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 605,588
Total square feet for expiring leases | ft² | 24,225
Total number of leases expiring | item | 8
Percentage of annual base rent for expiring leases | 20.00%
Through March 31, 2023 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 472,907
Total square feet for expiring leases | ft² | 13,151
Total number of leases expiring | item | 7
Percentage of annual base rent for expiring leases | 16.00%
Through March 31, 2024 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 484,028
Total square feet for expiring leases | ft² | 14,668
Total number of leases expiring | item | 8
Percentage of annual base rent for expiring leases | 17.00%
Through March 31, 2025 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 308,905
Total square feet for expiring leases | ft² | 12,630
Total number of leases expiring | item | 4
Percentage of annual base rent for expiring leases | 11.00%
Through March 31, 2030 |
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
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- 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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Data Type: | num:areaItemType
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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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