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RENTAL INCOME (Commercial Leases) (Details) | 3 Months Ended
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Mar. 31, 2017 USD ($) ft² item
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 2,894,780
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, 2017 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 208,937
Total square feet for expiring leases | ft² | 13,167
Total number of leases expiring | item | 9
Percentage of annual base rent for expiring leases | 7.00%
Through December 31, 2018 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 459,360
Total square feet for expiring leases | ft² | 13,540
Total number of leases expiring | item | 9
Percentage of annual base rent for expiring leases | 16.00%
Through December 31, 2019 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 631,614
Total square feet for expiring leases | ft² | 23,380
Total number of leases expiring | item | 12
Percentage of annual base rent for expiring leases | 22.00%
Through December 31, 2020 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 128,338
Total square feet for expiring leases | ft² | 1,786
Total number of leases expiring | item | 4
Percentage of annual base rent for expiring leases | 4.00%
Through December 31, 2021 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 1,121,202
Total square feet for expiring leases | ft² | 47,050
Total number of leases expiring | item | 8
Percentage of annual base rent for expiring leases | 39.00%
Through December 31, 2022 |
RENTAL INCOME |
Annual base rent for expiring leases | $ | $ 93,702
Total square feet for expiring leases | ft² | 2,491
Total number of leases expiring | item | 2
Percentage of annual base rent for expiring leases | 3.00%
Through December 31, 2023 |
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%

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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
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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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
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