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Net Income Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Numerator
Net income available to common shareholders	$ 566,011us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 755,125us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,597,788us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,481,542us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator
Weighted average number of common shares — Basic	32,861,001us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	32,358,163us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	32,789,157us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	30,328,344us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Weighted average number of common shares and dilutive potential common shares used in diluted EPS	32,958,218us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	32,732,049us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	32,909,981us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	32,503,460us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per common share - Basic (in dollars per share)	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.08us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic
Net income (loss) per common share - Diluted (in dollars per share)	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted
Contingent restricted stock grants
Effect of dilutive securities:
Weighted average of securities	5,954us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = epm_ContingentRestrictedStockGrantsMember	0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = epm_ContingentRestrictedStockGrantsMember	3,568us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = epm_ContingentRestrictedStockGrantsMember	0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = epm_ContingentRestrictedStockGrantsMember
Stock options
Effect of dilutive securities:
Weighted average of securities	91,263us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember	373,886us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember	117,256us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember	2,175,116us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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