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Stock-Based Incentive Plan - Stock Options and Incentive Warrants (Details) (USD $) | 9 Months Ended
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Mar. 31, 2015
Common Stock |  |
Additional disclosures of Stock Options and Incentive Warrants |  |
Market price of common stock on the last trading date of the period (in dollars per share) | $ 5.95 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Stock Options and Incentive Warrants |  |
Number of Stock Options and Incentive Warrants |  |
Stock Options and Incentive Warrants outstanding at the beginning of the period (in shares) | 178,061 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingNumber / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember |
Stock Options and Incentive Warrants, Exercised (in shares) | (87,000)epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisesInPeriod / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember |
Stock Options and Incentive Warrants outstanding at the end of the period (in shares) | 91,061 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingNumber / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember |
Vested or expected to vest at the end of the period (in shares) | 91,061 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember |
Exercisable at the end of the period (in shares) | 91,061 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisableNumber / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember |
Weighted Average Exercise Price |  |
Stock Options and Incentive Warrants outstanding at the beginning of the period (in dollars per share) | $ 2.08 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember |
Stock Options and Incentive Warrants, Exercised (in dollars per share) | $ 1.63 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember |
Stock Options and Incentive Warrants outstanding at the end of the period (in dollars per share) | $ 2.50 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember |
Vested or expected to vest at the end of the period (in dollars per share) | $ 2.50 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember |
Exercisable at the end of the period (in dollars per share) | $ 2.50 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember |
Stock Options and Incentive Warrants outstanding at the end of the period | $ 313,720 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingAggregateIntrinsicValue / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember | [1]
Vested or expected to vest at the end of the period | 313,720 epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember | [1]
Exercisable at the end of the period (in dollars) | $ 313,720 epm_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndIncentiveWarrantsExercisableAggregateIntrinsicValue / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember | [1]
Stock Options and Incentive Warrants outstanding at the end of the period | 1 year 7 months 6 days |
Vested or expected to vest at the end of the period | 1 year 7 months 6 days |
Exercisable at the end of the period | 1 year 7 months 6 days |
[1] | Based upon the difference between the market price of our common stock on the last trading date of the period ($5.95 as of March 31, 2015) and the Stock Option exercise price of in-the-money Stock Options.

X
- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options and incentive warrants outstanding and currently exercisable. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options and incentive warrants outstanding as of the balance sheet date can be currently converted under the option plan or incentive warrants plan. + References No definition available. + Details
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- Definition As of the balance sheet date, the weighted average price at which grantees can acquire the shares reserved for issuance on vested portions of options and Incentive Warrants outstanding and currently exercisable under the stock option and incentive warrants plans. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for vested portions of options and incentive warrants outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five month. + References No definition available. + Details
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- Definition The number of share options (or share units) and incentive warrants exercised during the current period. + References No definition available. + Details
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- Definition Weighted average price at which option and warrant holders acquired shares when converting their Stock Options and Incentive Warrants into shares. + References No definition available. + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan and incentive warrants as authorized by the board of directors that validly exist and are outstanding as of the balance sheet date, including vested options. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option and incentive warrants plans. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for option and incentive warrants awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options and incentive warrants outstanding. + References No definition available. + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options and incentive warrants outstanding can be converted under the option and incentive warrants plans. + References No definition available. + Details
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- Definition As of the balance sheet date, the weighted average exercise price for outstanding Stock Options and Incentive Warrants that are fully vested or expected to vest. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options and incentive warrants outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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