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Receivables (Details) (USD $) | Dec. 31, 2014 | Jun. 30, 2014 | Nov. 01, 2014
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Related Party Transaction [Line Items] |  |  |
Receivables from oil and gas sales | $ 2,198,912 us-gaap_AccountsReceivableNetCurrent | $ 1,456,146 us-gaap_AccountsReceivableNetCurrent |
Receivable from suspended overriding royalty interest | 712,100 epm_OilAndGasPropertiesOverridingRoyaltyInterestReceivableSuspendedNetCurrent | 0 epm_OilAndGasPropertiesOverridingRoyaltyInterestReceivableSuspendedNetCurrent |
Other | 13,558 us-gaap_OtherReceivablesNetCurrent | 1,066 us-gaap_OtherReceivablesNetCurrent |
Receivables | $ 2,924,570 us-gaap_ReceivablesNetCurrent | $ 1,457,212 us-gaap_ReceivablesNetCurrent |
Denbury Resources, Inc |  |  |
Related Party Transaction [Line Items] |  |  |
Suspended payments related to overriding royalty interest, percentage |  |  | 2.89155%epm_RelatedPartyTransactionsPercentageofOverridingRoyaltyInterestwithSuspendedPayments / us-gaap_CounterpartyNameAxis = epm_DenburyResourcesIncMember
Usual percentage of overriding royalty interest payment |  |  | 7.4052%epm_RelatedPartyTransactionsPaymentPercentageofOverridingRoyaltyInterest / us-gaap_CounterpartyNameAxis = epm_DenburyResourcesIncMember

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- Definition Oil And Gas Properties,Overriding Royalty Interest Receivable Suspended, Net, Current + References No definition available. + Details
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- Definition Related Party Transactions, Payment Percentage of Overriding Royalty Interest + References No definition available. + Details
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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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- Definition The carrying amount of other receivables, net, due within one year of the balance sheet date (or one operating cycle, if longer) from third parties or arising from transactions not separately disclosed. + References No definition available. + Details
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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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