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Commitments and Contingencies - Narrative (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Feb. 26, 2015 | Jan. 26, 2015
Commitments and Contingencies |  |  |  |  |  |
Overriding Royalty Interest in Delhi Unit Purchased |  |  | 4.8119%epm_LossContingenciesPercentageOfOverridingRoyaltyInterestInDelhiUnitPurchased |  |  |
Rent Expense | $ 43,776 us-gaap_OperatingLeasesRentExpenseNet | $ 44,473 us-gaap_OperatingLeasesRentExpenseNet | $ 131,327 us-gaap_OperatingLeasesRentExpenseNet | $ 131,151 us-gaap_OperatingLeasesRentExpenseNet |  |
Employment Contracts |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |
Number of employment agreements |  |  | 2 epm_LossContingencyNumberOfSeniorExecutivesUnderAgreement / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EmploymentContractsMember |  |  |
Estimated obligation of employment contract | 473,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EmploymentContractsMember |  | 473,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EmploymentContractsMember |  |  |
Employment Contracts | Low end of the range |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |
Benefit period |  |  | 6 months |  |  |
Employment Contracts | High end of the range |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |
Benefit period |  |  | 1 year |  |  |
Denbury Resources, Inc |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |
Suspended payments related to overriding royalty interest, percentage |  |  |  |  |  | 2.89155%epm_RelatedPartyTransactionsPercentageofOverridingRoyaltyInterestwithSuspendedPayments / us-gaap_CounterpartyNameAxis = epm_DenburyResourcesIncMember
Amount of overriding royalty interest previously suspended |  |  |  |  | $ 712,000 epm_RelatedPartyTransactionsOverridingRoyaltyInterestwithSuspendedPaymentsAmountPreviouslySuspended / us-gaap_CounterpartyNameAxis = epm_DenburyResourcesIncMember |

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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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