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Note 16 - Organizational Restructuring (Details Textual) $ in Millions	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Feb. 23, 2024
Number Of Employees			110
Percentage of Workforce			12.00%
Restructuring Reserve	$ 0.8	$ 1.1
Operating Expenses [Member]
Restructuring Reserve	$ 1.9

X

- Definition

The number of employees in the workforce reduction.

+ References

No definition available.

+ Details

Name:	hnrg_NumberOfEmployeesWorkforceReduction
Namespace Prefix:	hnrg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The percentage of the workforce Reduction.

+ References

No definition available.

+ Details

Name:	hnrg_PercentageOfWorkforceReduction
Namespace Prefix:	hnrg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: