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EMPLOYEE BENEFITS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
EMPLOYEE BENEFITS |  |
Employee benefit costs | $ 16,200 | $ 22,080
Other labor-related expenses | 4,000 | 4,900
Insured maximum exposure per employee | 1,000 |
Aggregate insurance deductible for employees | 4,000 |
Operating Expense |  |
EMPLOYEE BENEFITS |  |
Employee benefit costs | $ 15,200 | $ 21,500

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- Definition Represents the amount of aggregate insurance deductible for employees, with regard to workers' compensation. + References No definition available. + Details
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Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of employee benefit costs recorded during the period. + References No definition available. + Details
Name: | hnrg_EmployeeBenefitCosts
Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the insurance maximum exposure per employee with regard to workers' compensation. + References No definition available. + Details
Name: | hnrg_InsuredMaximumExposurePerEmployee
Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of labor-related expenses classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |