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RENTAL INCOME (Commercial Leases) (Details) | 9 Months Ended
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Sep. 30, 2019 USD ($) ft² item
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 2,950,315
Total square feet for expiring leases | ft² | 107,524
Total number of leases expiring | item | 48
Percentage of annual base rent for expiring leases | 100.00%
Through March 31, 2020 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 213,099
Total square feet for expiring leases | ft² | 11,062
Total number of leases expiring | item | 12
Percentage of annual base rent for expiring leases | 7.00%
Through March 31, 2021 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 887,955
Total square feet for expiring leases | ft² | 37,817
Total number of leases expiring | item | 10
Percentage of annual base rent for expiring leases | 30.00%
Through March 31, 2022 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 538,983
Total square feet for expiring leases | ft² | 17,038
Total number of leases expiring | item | 7
Percentage of annual base rent for expiring leases | 18.00%
Through March 31, 2023 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 405,072
Total square feet for expiring leases | ft² | 12,546
Total number of leases expiring | item | 6
Percentage of annual base rent for expiring leases | 14.00%
Through March 31, 2024 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 747,762
Total square feet for expiring leases | ft² | 24,903
Total number of leases expiring | item | 11
Percentage of annual base rent for expiring leases | 25.00%
Through March 31, 2025 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 14,994
Total square feet for expiring leases | ft² | 308
Total number of leases expiring | item | 1
Percentage of annual base rent for expiring leases | 1.00%
Through March 31, 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
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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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