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Stock-Based Incentive Plan - Stock Options and Incentive Warrants (Details) (USD $)	6 Months Ended
	Dec. 31, 2014		Jun. 30, 2014
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)	$ 7.43us-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)	141,061epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingNumber / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember		178,061epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingNumber / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember
Stock options and Incentive Warrants, Exercised (in shares)	37,000epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisesInPeriod / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember
Stock Options and Incentive Warrants outstanding at the end of the period (in shares)	141,061epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingNumber / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember		178,061epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingNumber / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember
Vested or expected to vest at the end of the period (in shares)	141,061epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember
Exercisable at the end of the period (in shares)	141,061epm_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)	$ 2.25epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember		$ 2.08epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember
Stock Options and Incentive Warrants, Exercised (in dollars per share)	$ 1.39epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember
Stock Options and Incentive Warrants outstanding at the end of the period (in dollars per share)	$ 2.25epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember		$ 2.08epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember
Vested or expected to vest at the end of the period (in dollars per share)	$ 2.25epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember
Exercisable at the end of the period (in dollars per share)	$ 2.25epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember
Stock Options and Incentive Warrants outstanding at the end of the period	$ 729,991epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsOutstandingAggregateIntrinsicValue / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember	[1]
Vested or expected to vest at the end of the period	729,991epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember	[1]
Exercisable at the end of the period (in dollars)	$ 729,991epm_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndIncentiveWarrantsExercisableAggregateIntrinsicValue / us-gaap_AwardTypeAxis = epm_StockOptionsAndIncentiveWarrantsMember	[1]
Stock Options and Incentive Warrants outstanding at the end of the period	1 year 3 months 18 days
Vested or expected to vest at the end of the period	1 year 3 months 18 days
Exercisable at the end of the period	1 year 3 months 18 days
[1] Based upon the difference between the market price of our common stock on the last trading date of the period ($7.43 as of December 31, 2014) and the Stock Option exercise price of in-the-money Stock Options.

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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.

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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.

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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.

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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.

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The number of share options (or share units) and incentive warrants exercised during the current period.

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Weighted average price at which option and warrant holders acquired shares when converting their Stock Options and Incentive Warrants into shares.

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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.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option and incentive warrants plans.

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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.

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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.

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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.

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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.

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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.

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