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PREPAID EXPENSES and OTHER ASSETS (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
PREPAID EXPENSES and OTHER ASSETS |  |
Security deposits | $ 3,582,000 | $ 3,601,000
Escrow deposits to fund future capital improvements | 1,903,000 | 1,784,000
Intangible assets, net of accumulated amortization | 530,000 | 677,000
Accumulated amortization on intangible assets | 1,019,000 | 872,000
Financing fees, net | 36,000 | 52,000
Financing fees accumulated amortization amount | $ 146,000 | $ 130,000

X
- Definition This element represents the accumulated amortization of deferred financing and leasing cost incurred by the entity during the reporting period. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the deferred financing and leasing cost incurred by the entity during the reporting period. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Restricted cash held in escrow to fund future capital improvements. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483154/926-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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