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Receivables (Details) (USD $)
Dec. 31, 2014
Jun. 30, 2014
Nov. 01, 2014
Related Party Transaction [Line Items]      
Receivables from oil and gas sales $ 2,198,912us-gaap_AccountsReceivableNetCurrent $ 1,456,146us-gaap_AccountsReceivableNetCurrent  
Receivable from suspended overriding royalty interest 712,100epm_OilAndGasPropertiesOverridingRoyaltyInterestReceivableSuspendedNetCurrent 0epm_OilAndGasPropertiesOverridingRoyaltyInterestReceivableSuspendedNetCurrent  
Other 13,558us-gaap_OtherReceivablesNetCurrent 1,066us-gaap_OtherReceivablesNetCurrent  
Receivables $ 2,924,570us-gaap_ReceivablesNetCurrent $ 1,457,212us-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