XML 30 R17.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Note 11 - Self-Insurance | 6 Months Ended
--- | ---
Jun. 30, 2022
Notes to Financial Statements |
Self Insurance [Text Block] |
(11) | SELF-INSURANCE
We self-insure our underground mining equipment. Such equipment is allocated among seven mining units dispersed over ten miles. The historical cost of such equipment was approximately $269 million and $260 million as of June 30, 2022, and December 31, 2021, respectively. Restricted cash of $3.5 million and $3.3 million as of June 30, 2022, and December 31, 2021, respectively, represents cash held and controlled by a third party and is restricted for future workers’ compensation claim payments.

X
- Definition The entire disclosure for self insurance. + References No definition available. + Details
Name: | hnrg_SelfInsuranceTextBlock
Namespace Prefix: | hnrg_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration