XML 82 R72.htm IDEA: XBRL DOCUMENT
v3.25.2

EMPLOYEE BENEFIT 401(k) PLANS (Details) | 6 Months Ended
--- | ---
Jun. 30, 2025 USD ($)
EMPLOYEE BENEFIT 401(k) PLANS |
Maximum deferral percentage | 90.00%
Matching contribution (as a percent) | 50.00%
Percent of compensation | 6.00%
Employee contribution vesting percentage | 100.00%
Years of service required to vest in employer contributions | 2 years
Annual vesting percentage | 20.00%
Cumulative vesting percentage | 100.00%
Years of service required to vest 100% in employer contributions | 6 years
Total plan expense | $ 32,000

X
- Definition Percentage of employee contributions that are vested. + References No definition available. + Details
Name: | nen_DefinedContributionPlanEmployeeContributionsVestingPercentage
Namespace Prefix: | nen_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employer's matching contributions to a defined contribution plan that cumulatively vested in a given year. + References No definition available. + Details
Name: | nen_DefinedContributionPlanEmployersMatchingContributionCumulativeVestingPercentage
Namespace Prefix: | nen_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The years of service needed in order to begin vesting in employer contributions. + References No definition available. + Details
Name: | nen_YearsOfServiceNeededForVestingToBegin
Namespace Prefix: | nen_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The years of service needed in order to fully vest in employer contributions. + References No definition available. + Details
Name: | nen_YearsOfServiceNeededToFullyVestInEmployerContributions
Namespace Prefix: | nen_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration