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Stock-Based Incentive Plan - Narrative (Details) (USD $) | 3 Months Ended | 9 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Restricted Stock and Contingent Restricted Stock |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |
Stock-based compensation expense | $ 242,835 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = epm_RestrictedStockandContingentRestrictedStockMember | $ 444,981 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = epm_RestrictedStockandContingentRestrictedStockMember | $ 731,192 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = epm_RestrictedStockandContingentRestrictedStockMember | $ 1,134,841 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = epm_RestrictedStockandContingentRestrictedStockMember |
Performance-based Awards |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |
Dividends paid on unvested and not probable awards |  |  |  |  | $ 15,328 epm_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedandNotProbableCashDividendsPaid / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
2004 Stock Plan |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |
Number of shares of 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 |  |
Number of shares remaining available for grant under plan | 542,529 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember |  | 542,529 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = epm_EvolutionPetroleumCorporationAmendedAndRestated2004StockPlanMember |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested and Not Probable, Cash Dividends Paid + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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