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Stockholders' Equity - Common Stock (Details) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Mar. 31, 2015 quarter | Dec. 31, 2014 | Sep. 30, 2014 | Mar. 31, 2015 quarter
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cash dividend per common share | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.05 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid |
Number of quarterly dividends |  | 3 epm_NumberofQuarterlyDividends |  |  | 3 epm_NumberofQuarterlyDividends
Cash dividends to common stockholders |  |  |  |  | $ 8,192,989 us-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 |  | 6,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember |  |  | 6,500,000 us-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 |  | 144,468 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember |  |  | 144,468 us-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 |  | 43,258 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember / us-gaap_TitleOfIndividualAxis = epm_VariousEmployeesMember |  |  | 43,258 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember / us-gaap_TitleOfIndividualAxis = 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 |  | 25,740 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  | 25,740 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember

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