Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Mar. 16, 2023	Jun. 30, 2022
Document Information [Line Items]
Entity Central Index Key	0000788965
Entity Registrant Name	HALLADOR ENERGY CO
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	001-3473
Entity Incorporation, State or Country Code	CO
Entity Tax Identification Number	84-1014610
Entity Address, Address Line One	1183 East Canvasback Drive
Entity Address, City or Town	Terre Haute
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	47802
City Area Code	812
Local Phone Number	299.2800
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	HNRG
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float				$ 116,685,277
Entity Common Stock, Shares Outstanding			32,982,605
Auditor Firm ID	248	166
Auditor Name	GRANT THORNTON LLP	PLANTE & MORAN, PLLC
Auditor Location	Tulsa, Oklahoma	Denver, Colorado