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Net Income (Loss) Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Numerator
Net income (loss) available to common shareholders	$ 1,071,342us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (577,459)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,031,777us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 726,417us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator
Weighted average number of common shares — Basic	32,825,631us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	30,063,676us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	32,754,016us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	29,335,498us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Weighted average number of common shares and dilutive potential common shares used in diluted EPS	32,947,280us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	30,063,676us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	32,884,754us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	32,377,918us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per common share - Basic (in dollars per share)	$ 0.03us-gaap_EarningsPerShareBasic	$ (0.02)us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ 0.03us-gaap_EarningsPerShareBasic
Net income (loss) per common share - Diluted (in dollars per share)	$ 0.03us-gaap_EarningsPerShareDiluted	$ (0.02)us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted
Contingent restricted stock grants
Effect of dilutive securities:
Weighted average of securities	6,432us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = epm_ContingentRestrictedStockGrantsMember	0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = epm_ContingentRestrictedStockGrantsMember	1,785us-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	115,217us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember	0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember	128,953us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember	3,042,420us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember

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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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