XML 86 R68.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Supplemental Disclosure of Cash Flow Information - Schedule of Supplement Cash Flow (Details) - USD ($) | 12 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
Supplemental Cash Flow Elements [Abstract] |  |  |
Income taxes paid | $ 540,000 | $ 220,000 | $ 755,941
Income tax refunds | 1,556,999 | 331,733 | 0
Non-cash transactions: |  |  |
Increase (decrease) in accrued purchases of property and equipment | (2,250,048) | 5,422,566 | (183,766)
Deferred loan costs charged to oil and gas property costs | 107,196 | 0 | 0
Oil and natural gas property costs attributable to the recognition of asset retirement obligations | 140,151 | 576,039 | 66,976
Mengel working interest acquired in Delhi Field litigation settlement | 596,500 | 0 | 0
Royalty rights acquired through non-monetary exchange of patent and trademark assets | 108,512 | 0 | 0
Previously acquired Company shares swapped by holders to pay stock option exercise price | 76,500 | 0 | 618,606
Accrued purchases of treasury stock | $ (170,283) | $ 170,283 | $ 0

X
- Definition Amount of asset retirement obligations incurred during the period, net of certain increases or decreases in the amount of the asset retirement obligation during the current period that may include changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References No definition available. + Details
Name: | epm_AssetRetirementObligationLiabilitiesIncurredNet
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Deferred Loan Costs Reclassified to Oil and Gas Property Cost + References No definition available. + Details
Name: | epm_DeferredLoanCostsReclassifiedtoOilandGasPropertyCost
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase (Decrease) in Accounts Payable Used to Acquire Property and Equipment + References No definition available. + Details
Name: | epm_IncreaseDecreaseinAccountsPayableUsedtoAcquirePropertyandEquipment
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Non Cash Transaction, Accrued Purchases of Treasury Stock + References No definition available. + Details
Name: | epm_NonCashTransactionAccruedPurchasesofTreasuryStock
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Non Cash Transaction, Royalty Rights Acquired Through Non-Monetary Exchange of Assets + References No definition available. + Details
Name: | epm_NonCashTransactionRoyaltyRightsAcquiredThroughNonMonetaryExchangeofAssets
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Noncash Gain (Loss) on Litigation Settlement, Fair Value + References No definition available. + Details
Name: | epm_NoncashGainLossonLitigationSettlementFairValue
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Value of shares swapped by option holders in lieu of tax payments for exercise of option. + References No definition available. + Details
Name: | epm_NoncashSettlementRelatedtoTaxWithholdingforSharebasedCompensation
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
Name: | us-gaap_IncomeTaxesPaid
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
Name: | us-gaap_ProceedsFromIncomeTaxRefunds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration