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Document and Entity Information (USD $)
 12 Months Ended
Jun. 30, 2012
Sep. 11, 2012
Dec. 31, 2011
Document and Entity Information      
Entity Registrant Name EVOLUTION PETROLEUM CORP    
Entity Central Index Key 0001006655    
Document Type 10-K    
Document Period End Date Jun. 30, 2012    
Amendment Flag false    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   28,840,163  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY