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Cover - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 25, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Current Fiscal Year End Date --12-31    
Entity File Number 000-06814    
Entity Registrant Name US ENERGY CORP    
Entity Central Index Key 0000101594    
Entity Tax Identification Number 83-0205516    
Entity Incorporation, State or Country Code WY    
Entity Address, Address Line One 675 Bering    
Entity Address, Address Line Two Suite 390    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77057    
City Area Code (303)    
Local Phone Number 993-3200    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol USEG    
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 Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 21,163,394
Entity Common Stock, Shares Outstanding   24,873,812  
Documents Incorporated by Reference Portions of the registrant’s definitive proxy statement relating to its 2022 annual meeting of shareholders (the “2022 Proxy Statement”) are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. The 2022 Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.    
ICFR Auditor Attestation Flag false    
Auditor Name Plante & Moran, PLLC    
Auditor Location Denver, Colorado    
Auditor Firm ID 166