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Net Income Per Share - Schedule of Dilutive Securities (Details) (USD $) | 9 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Outstanding Potential Dilutive Securities |  |
Weighted Average Exercise Price (in dollars per share) | $ 1.55 epm_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice |
Balance at the end of the period (in shares) | 147,347 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Contingent restricted stock grants |  |
Outstanding Potential Dilutive Securities |  |
Weighted Average Exercise Price (in dollars per share) | $ 0.00 epm_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = epm_ContingentRestrictedStockGrantsMember |
Balance at the end of the period (in shares) | 56,286 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = epm_ContingentRestrictedStockGrantsMember |
Stock options |  |
Outstanding Potential Dilutive Securities |  |
Weighted Average Exercise Price (in dollars per share) | $ 2.50 epm_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | $ 2.02 epm_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember
Balance at the end of the period (in shares) | 91,061 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 228,061 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember

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- Definition Represents the weighted average exercise price of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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