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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	$ 43,776us-gaap_OperatingLeasesRentExpenseNet	$ 44,473us-gaap_OperatingLeasesRentExpenseNet	$ 131,327us-gaap_OperatingLeasesRentExpenseNet	$ 131,151us-gaap_OperatingLeasesRentExpenseNet
Employment Contracts
Commitments and Contingencies
Number of employment agreements			2epm_LossContingencyNumberOfSeniorExecutivesUnderAgreement / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EmploymentContractsMember
Estimated obligation of employment contract	473,000us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EmploymentContractsMember		473,000us-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					$ 712,000epm_RelatedPartyTransactionsOverridingRoyaltyInterestwithSuspendedPaymentsAmountPreviouslySuspended / us-gaap_CounterpartyNameAxis = epm_DenburyResourcesIncMember

X

- Definition

Represents the percentage of overriding royalty interest in Delhi Unit purchased by the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of senior executives of the entity covered under employment agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period of benefits, includes payment of base pay and certain medical and disability benefits, after the termination from employment.

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Related Party Transactions, Overriding Royalty Interest with Suspended Payments, Amount Previously Suspended

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Related Party Transactions, Percentage of Overriding Royalty Interest with Suspended Payments

+ References

No definition available.

+ Details

Name:	epm_RelatedPartyTransactionsPercentageofOverridingRoyaltyInterestwithSuspendedPayments
Namespace Prefix:	epm_
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X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- 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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Balance Type:	debit
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

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- Details

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