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Note 9 - Stock Compensation Plans - Vesting of Non-vested RSU Grants (Details)	Jun. 30, 2024 shares
RSUs vesting (in shares)	1,040,486
Vesting in 2024 [Member] | Restricted Stock Units (RSUs) [Member]
RSUs vesting (in shares)	1,000
Represents vesting in 2025 [Member] | Restricted Stock Units (RSUs) [Member]
RSUs vesting (in shares)	641,144
Represents vesting in 2026 [Member] | Restricted Stock Units (RSUs) [Member]
RSUs vesting (in shares)	199,171
Represents vesting in 2027 [Member] | Restricted Stock Units (RSUs) [Member]
RSUs vesting (in shares)	199,171

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that are to vest in a future period.

+ References

No definition available.

+ Details

Name:	hnrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInFuturePeriod
Namespace Prefix:	hnrg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_VestingAxis=hnrg_VestingIn2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VestingAxis=hnrg_RepresentsVestingIn2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VestingAxis=hnrg_RepresentsVestingIn2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VestingAxis=hnrg_RepresentsVestingIn2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: