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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2017
Mar. 21, 2018
Jun. 30, 2017
Document And Entity Information      
Entity Registrant Name US ENERGY CORP    
Entity Central Index Key 0000101594    
Document Type 10-K    
Document Period End Date Dec. 31, 2017    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity a Well-known Seasoned Issuer No    
Entity a Voluntary Filer No    
Entity's Reporting Status Current Yes    
Entity Filer Category Smaller Reporting Company    
Entity Public Float     $ 4,171,464
Entity Common Stock, Shares Outstanding   12,440,927  
Trading Symbol USEG    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017