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RENTAL INCOME (Commercial Leases) (Details) | 3 Months Ended
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Mar. 31, 2022 USD ($) ft² item
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 2,777,027
Total square feet for expiring leases | ft² | 108,154
Total number of leases expiring | item | 51
Percentage of annual base rent for expiring leases | 100.00%
2023 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 939,617
Total square feet for expiring leases | ft² | 50,247
Total number of leases expiring | item | 20
Percentage of annual base rent for expiring leases | 35.00%
2024 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 611,637
Total square feet for expiring leases | ft² | 18,170
Total number of leases expiring | item | 8
Percentage of annual base rent for expiring leases | 22.00%
2025 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 426,122
Total square feet for expiring leases | ft² | 15,998
Total number of leases expiring | item | 9
Percentage of annual base rent for expiring leases | 15.00%
2026 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 223,001
Total square feet for expiring leases | ft² | 3,473
Total number of leases expiring | item | 4
Percentage of annual base rent for expiring leases | 8.00%
2027 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 395,326
Total square feet for expiring leases | ft² | 15,162
Total number of leases expiring | item | 8
Percentage of annual base rent for expiring leases | 14.00%
2028 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 38,874
Total square feet for expiring leases | ft² | 1,254
Total number of leases expiring | item | 1
Percentage of annual base rent for expiring leases | 1.00%
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: | dtr-types: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: | dtr-types: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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- Details
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