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Asset Retirement Obligations (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2014 | Jun. 30, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |  |  |  |
Asset retirement obligations — beginning of period |  |  |  |  |  | $ 352,215 us-gaap_AssetRetirementObligation |  | $ 615,551 us-gaap_AssetRetirementObligation
Liabilities sold |  |  | (52,526)epm_AssetRetirementObligationLiabilitiesSold |  |  | (48,273)epm_AssetRetirementObligationLiabilitiesSold |  |
Liabilities incurred |  |  | 564,019 us-gaap_AssetRetirementObligationLiabilitiesIncurred | [1] |  | 0 us-gaap_AssetRetirementObligationLiabilitiesIncurred | [1] |
Liabilities settled |  |  | (137,604)us-gaap_AssetRetirementObligationLiabilitiesSettled |  |  | (323,665)us-gaap_AssetRetirementObligationLiabilitiesSettled |  |
Accretion of discount | 10,924 us-gaap_AssetRetirementObligationAccretionExpense | 9,631 us-gaap_AssetRetirementObligationAccretionExpense | 23,697 us-gaap_AssetRetirementObligationAccretionExpense |  | 34,977 us-gaap_AssetRetirementObligationAccretionExpense | 41,626 us-gaap_AssetRetirementObligationAccretionExpense |  |
Revision of previous estimates |  |  | 9,670 us-gaap_AssetRetirementObligationRevisionOfEstimate |  |  | 66,976 us-gaap_AssetRetirementObligationRevisionOfEstimate |  |
Less obligations due within one year | (10,219)us-gaap_AssetRetirementObligationCurrent |  | (10,219)us-gaap_AssetRetirementObligationCurrent |  |  | (146,703)us-gaap_AssetRetirementObligationCurrent |  |
Asset retirement obligations — end of period | $ 749,252 us-gaap_AssetRetirementObligationsNoncurrent |  | $ 749,252 us-gaap_AssetRetirementObligationsNoncurrent |  |  | $ 205,512 us-gaap_AssetRetirementObligationsNoncurrent |  |
[1] | Liabilities incurred during the period relate to our share of the the estimated abandonment costs of the wells and facilities in the Delhi field subsequent to the reversion of our working interest.

X
- Definition Amount of asset retirement obligations sold, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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