STOCK COMPENSATION PLANS (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
STOCK COMPENSATION PLANS (Details) - USD ($) $ in Millions	May 29, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense		$ 0.6	$ 1.1	$ 2.1	$ 3.3
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Increase in number of shared available for issuance	2,000,000
Vesting period				3 years
Unrecognized stock compensation expense		$ 6.4		$ 6.4
Number of shares available for grants (in shares)		1,897,154		1,897,154

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

HALLADOR ENERGY CO 10-Q