Note 1 - General Business (Details Textual)	1 Months Ended
Sep. 30, 2022
Hoosier Energy [Member] \| Forecast [Member]
Long-Term Contract for Purchase of Electric Power, Term (Year)	3 years 6 months

Represents the Length of the term for the contract to purchase electric power.

No definition available.

Name:	hnrg_LongtermContractForPurchaseOfElectricPowerTerm
Namespace Prefix:	hnrg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration