XML 78 R41.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Property and Equipment (Details 2) (USD $) | 12 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Costs excluded from amortization during the period |  |
Leasehold acquisition costs and other | $ 243,593 | $ 3,869,111
Costs excluded from amortization at the end of period |  |
Leasehold acquisition costs and other | $ 4,112,704 |

X
- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property. It also includes other capitalized costs not otherwise disclosed separately. + References No definition available. + Details
Name: | epm_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationAcquisitionAndOtherPeriodCost
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to purchase, lease or otherwise acquire an unproved property. It also includes other capitalized costs not otherwise disclosed separately. + References No definition available. + Details
Name: | epm_OilAndNaturalGasPropertiesExcludedFromAmortizationAcquisitionAndOtherCosts
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulativeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration