Document And Entity Information (USD $)	3 Months Ended
	Jun. 30, 2011	Aug. 05, 2011
Document and Entity Information [Abstract]
Entity Registrant Name	HALLADOR ENERGY COMPANY
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		28,163,180
Entity Public Float	$ 66,688,118
Amendment Flag	false
Entity Central Index Key	0000788965
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	Jun. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q1