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TAXABLE INCOME AND TAX BASIS (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($)
TAXABLE INCOME AND TAX BASIS |
Taxable income | $ 21,102,000
Excess amount of statement income over taxable income | 5,440,000
Excess amount of cumulative statement basis over cumulative taxable basis | 10,000,000
Excess amount of statement income from joint venture investments over taxable income | $ 1,000,000

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- Definition Represents the amount of difference between taxable income and statement income. + References No definition available. + Details
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Namespace Prefix: | nen_
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Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount by which taxable income basis is less than statement income basis due to accelerated depreciation. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the cumulative basis amount by which taxable income basis is less than statement income basis. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The taxable net income or loss during a period. + 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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