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Note 10 - Employee Benefits (Details Textual) |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  | 100.00% |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 4.00% |
Participants in Employee Health Plan | 2,274 | 2,274 |
Health Care Cap Per Person |  | $ 200,000 |
Insured Capped Maximum Exposure, Health Care |  | 16,600,000 |
Employee Benefit Costs |  | 15,728,000 | $ 15,649,000
Other Labor-related Expenses |  | 2,900,000 | 1,900,000
Insured Maximum Exposure Per Employee |  | 1,000,000 |
Aggregate Insurance Deductible for Employees | $ 4,000,000 |  |
Operating Expense [Member] |  |  |
Employee Benefit Costs |  | $ 15,200,000 | $ 15,000,000.0

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

X
- 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

X
- Definition Represents the annual maximum claims paid per participant. + References No definition available. + Details
Name: | hnrg_HealthCareCapPerPerson
Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the annual total maximum exposure for health claims. + References No definition available. + Details
Name: | hnrg_InsuredCappedMaximumExposureHealthCare
Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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: | credit
Period Type: | duration

X
- Definition Represents the number of participants in the entity's employee health plan. + References No definition available. + Details
Name: | hnrg_ParticipantsInEmployeeHealthPlan
Namespace Prefix: | hnrg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 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

X
- Definition Amount of labor-related expenses classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_OtherLaborRelatedExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OperatingExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |