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Commitments and Contingencies - Narrative (Details) (USD $)	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Commitments and Contingencies
Rent Expense	$ 43,776	$ 41,918
Employment Contracts
Commitments and Contingencies
Number of employment agreements	2
Estimated obligation of employment contract	$ 473,000
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

X

- Definition

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

+ References

No definition available.

+ Details

Name:	epm_LossContingencyNumberOfSeniorExecutivesUnderAgreement
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

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

X

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
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

+ Details

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration