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Stockholders' Equity - Common Stock (Details) (USD $)
3 Months Ended 6 Months Ended
Dec. 31, 2014
quarter
Dec. 31, 2014
quarter
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash dividend per common share   $ 0.10us-gaap_CommonStockDividendsPerShareCashPaid  
Number of quarterly dividends 2epm_NumberofQuarterlyDividends 2epm_NumberofQuarterlyDividends  
Cash dividends to common stockholders $ 6,565,350us-gaap_DividendsCommonStockCash    
2004 Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of restricted common stock authorized for issuance under plan 6,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember
6,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember
 
2004 Stock Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of restricted common stock authorized for issuance under plan     144,468us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember
Various Employees | 2004 Stock Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of restricted common stock authorized for issuance under plan     43,258us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember
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= epm_VariousEmployeesMember
Directors | 2004 Stock Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of restricted common stock authorized for issuance under plan     25,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember