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v3.20.1

QUALIFYING ACCOUNTS (Tables) | 12 Months Ended
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Dec. 31, 2019
QUALIFYING ACCOUNTS |
Schedule of valuation and qualifying accounts |
|  |  |  | Additions |  |  |  |  |
|  | Balance at |  | Charged to |  | Charged to |  |  |  | Balance |
|  | Beginning |  | Costs and |  | other account |  | Deductions |  | at end |
Description |  | of Period |  | Expenses |  | describe |  | Describe(a) |  | of Period |
Year Ended December 31, 2019: |  |  |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | 532,161 |  | 445,909 |  |  |  | 737,959 |  | 240,111 |
Year Ended December 31, 2018: |  |  |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | 643,990 |  | 357,789 |  |  |  | 469,618 |  | 532,161 |
Year Ended December 31, 2017: |  |  |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | 523,004 |  | 422,109 |  |  |  | 301,123 |  | 643,990 |
| (a) |  | Uncollectible accounts written off

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- Definition Tabular disclosure of the schedule of allowance and reserve accounts including their beginning and ending balances, as well as a reconciliation by type of activity during the period. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | srt_ValuationAndQualifyingAccountsAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration