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RENTAL INCOME (Commercial Leases) (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) ft² item
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 2,712,907
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 | $ | $ 840,146
Total square feet for expiring leases | ft² | 54,821
Total number of leases expiring | item | 19
Percentage of annual base rent for expiring leases | 31.00%
2022 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 522,454
Total square feet for expiring leases | ft² | 13,380
Total number of leases expiring | item | 8
Percentage of annual base rent for expiring leases | 19.00%
2023 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 451,560
Total square feet for expiring leases | ft² | 13,871
Total number of leases expiring | item | 7
Percentage of annual base rent for expiring leases | 17.00%
2024 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 623,739
Total square feet for expiring leases | ft² | 20,709
Total number of leases expiring | item | 11
Percentage of annual base rent for expiring leases | 23.00%
2025 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 132,558
Total square feet for expiring leases | ft² | 1,523
Total number of leases expiring | item | 3
Percentage of annual base rent for expiring leases | 5.00%
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
Name: | us-gaap_LeaseContractualTermAxis=nen_OperatingLeasesExpirationPeriodYearFourMember
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- Details
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- Details
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