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RENTAL INCOME (Commercial Leases) (Details) | 3 Months Ended
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Mar. 31, 2021 USD ($) ft² item
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 2,726,276
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 | $ | $ 1,065,898
Total square feet for expiring leases | ft² | 59,415
Total number of leases expiring | item | 20
Percentage of annual base rent for expiring leases | 39.00%
2022 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 221,861
Total square feet for expiring leases | ft² | 6,392
Total number of leases expiring | item | 6
Percentage of annual base rent for expiring leases | 8.00%
2023 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 672,213
Total square feet for expiring leases | ft² | 19,432
Total number of leases expiring | item | 9
Percentage of annual base rent for expiring leases | 25.00%
2024 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 395,806
Total square feet for expiring leases | ft² | 14,868
Total number of leases expiring | item | 8
Percentage of annual base rent for expiring leases | 15.00%
2025 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 204,708
Total square feet for expiring leases | ft² | 3,473
Total number of leases expiring | item | 4
Percentage of annual base rent for expiring leases | 7.00%
2026 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 23,340
Total square feet for expiring leases | ft² | 724
Total number of leases expiring | item | 1
Percentage of annual base rent for expiring leases | 1.00%
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
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
Name: | us-gaap_OperatingLeasedAssetsLineItems
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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- Details
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- Details
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