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v3.22.1

Note 17 - Subsequent Event (Details Textual) | Feb. 14, 2022
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Subsequent Event [Member] | Hoosier Energy [Member] |
Purchase Power Agreement, Term (Year) | 3 years 6 months

X
- Definition Represents term of power purchase agreement. + References No definition available. + Details
Name: | hnrg_PurchasePowerAgreementTerm
Namespace Prefix: | hnrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetAcquisitionAxis=hnrg_HoosierEnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |