v3.23.2
Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2023
Aug. 07, 2023
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 Q2  
Document Fiscal Year Focus 2023  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2023  
Document Transition Report false  
Entity File Number 001-34743  
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 Shares, $.01 par value  
Trading Symbol HNRG  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   33,142,403