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Other Assets (Details) - USD ($) | Sep. 30, 2021 | Jun. 30, 2021
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Right of use asset under operating lease | $ 161,125 | $ 161,125
Less: Accumulated amortization of right of use asset | (102,383) | (90,336)
Other assets, net | $ 58,742 | $ 70,789

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- Definition Operating Lease, Right-Of-Use Asset, Accumulated Amortization + References No definition available. + Details
Name: | epm_OperatingLeaseRightOfUseAssetAccumulatedAmortization
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating Lease, Right-Of-Use Asset, Gross + References No definition available. + Details
Name: | epm_OperatingLeaseRightOfUseAssetGross
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of deferred cost assets and assets classified as other. + References No definition available. + Details
Name: | us-gaap_DeferredCostsAndOtherAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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