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RENTAL INCOME (Commercial Leases) (Details) | 9 Months Ended
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Sep. 30, 2018 USD ($) ft² item
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 2,905,127
Total square feet for expiring leases | ft² | 108,043
Total number of leases expiring | item | 46
Percentage of annual base rent for expiring leases | 100.00%
Through December 31, 2019 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 564,242
Total square feet for expiring leases | ft² | 27,747
Total number of leases expiring | item | 17
Percentage of annual base rent for expiring leases | 19.00%
Through December 31, 2020 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 165,607
Total square feet for expiring leases | ft² | 4,033
Total number of leases expiring | item | 5
Percentage of annual base rent for expiring leases | 6.00%
Through December 31, 2021 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 856,606
Total square feet for expiring leases | ft² | 36,895
Total number of leases expiring | item | 9
Percentage of annual base rent for expiring leases | 29.00%
Through December 31, 2022 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 519,523
Total square feet for expiring leases | ft² | 16,343
Total number of leases expiring | item | 6
Percentage of annual base rent for expiring leases | 18.00%
Through December 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 December 31, 2024 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 251,627
Total square feet for expiring leases | ft² | 6,629
Total number of leases expiring | item | 2
Percentage of annual base rent for expiring leases | 9.00%
Through December 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
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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
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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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