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RENTAL INCOME (Commercial Leases) (Details) | 6 Months Ended
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Jun. 30, 2020 USD ($) ft² item
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 2,835,154
Total square feet for expiring leases | ft² | 108,154
Total number of leases expiring | item | 49
Percentage of annual base rent for expiring leases | 100.00%
2021 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 759,320
Total square feet for expiring leases | ft² | 39,256
Total number of leases expiring | item | 18
Percentage of annual base rent for expiring leases | 27.00%
2022 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 605,587
Total square feet for expiring leases | ft² | 24,225
Total number of leases expiring | item | 8
Percentage of annual base rent for expiring leases | 21.00%
2023 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 421,687
Total square feet for expiring leases | ft² | 11,481
Total number of leases expiring | item | 7
Percentage of annual base rent for expiring leases | 15.00%
2024 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 491,548
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%
2025 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 414,562
Total square feet for expiring leases | ft² | 14,674
Total number of leases expiring | item | 7
Percentage of annual base rent for expiring leases | 15.00%
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
Name: | nen_OperatingLeasesAnnualBaseRentForExpiringLeases
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
Name: | nen_OperatingLeasesNumberOfLeasesExpiring
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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
Name: | nen_OperatingLeasesSquareFeetForExpiringLeases
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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Details
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- Details
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