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Note 11 - Employee Benefits (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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 | 2,221 |
Health Care Cap Per Person | $ 200,000 |
Insured Capped Maximum Exposure, Health Care | 19,000,000.0 |
Employee Benefit Costs | 15,649,000 | $ 19,465,000
Workers' compensation costs | 1,900,000 | 3,100,000
Insured Maximum Exposure Per Employee | 1,000,000 |
Aggregate Insurance Deductible for Employees | $ 4,000,000 |
Percentage Claims Are Below Average of Peers, Underground Coal Mining | 24.00% |
Operating Expense [Member] |  |
Employee Benefit Costs | $ 15,000,000.0 | $ 18,900,000

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 Represents the average percentage by which claims are below that of peers in underground coal mining in the state in which the reporting entity operates. + References No definition available. + Details
Name: | hnrg_PercentageClaimsAreBelowAverageOfPeersUndergroundCoalMining
Namespace Prefix: | hnrg_
Data Type: | num:percentItemType
Balance Type: | na
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: | num: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: | num: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=120395209&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: |