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Consolidated Condensed Statements of Operations (USD $)
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Revenues        
Total revenues $ 7,708,067us-gaap_SalesRevenueNet $ 4,392,289us-gaap_SalesRevenueNet $ 11,712,894us-gaap_SalesRevenueNet $ 9,025,988us-gaap_SalesRevenueNet
Operating costs        
Depreciation, depletion and amortization 917,757us-gaap_DepreciationDepletionAndAmortization 327,168us-gaap_DepreciationDepletionAndAmortization 1,287,107us-gaap_DepreciationDepletionAndAmortization 636,841us-gaap_DepreciationDepletionAndAmortization
Accretion of discount on asset retirement obligations 8,137us-gaap_AssetRetirementObligationAccretionExpense 12,418us-gaap_AssetRetirementObligationAccretionExpense 12,773us-gaap_AssetRetirementObligationAccretionExpense 25,346us-gaap_AssetRetirementObligationAccretionExpense
General and administrative expenses 1,606,501us-gaap_GeneralAndAdministrativeExpense [1] 2,642,082us-gaap_GeneralAndAdministrativeExpense [1] 3,111,094us-gaap_GeneralAndAdministrativeExpense [1] 4,571,033us-gaap_GeneralAndAdministrativeExpense [1]
Restructuring charges (5,431)us-gaap_RestructuringCharges [2] 1,332,186us-gaap_RestructuringCharges [2] (5,431)us-gaap_RestructuringCharges [2] 1,332,186us-gaap_RestructuringCharges [2]
Total operating costs 5,545,773us-gaap_OperatingExpenses 4,550,384us-gaap_OperatingExpenses 7,709,734us-gaap_OperatingExpenses 7,220,186us-gaap_OperatingExpenses
Income (loss) from operations 2,162,294us-gaap_OperatingIncomeLoss (158,095)us-gaap_OperatingIncomeLoss 4,003,160us-gaap_OperatingIncomeLoss 1,805,802us-gaap_OperatingIncomeLoss
Other        
Interest income 7,662us-gaap_InvestmentIncomeInterest 7,701us-gaap_InvestmentIncomeInterest 20,425us-gaap_InvestmentIncomeInterest 15,404us-gaap_InvestmentIncomeInterest
Interest (expense) (12,159)us-gaap_InterestExpense (16,582)us-gaap_InterestExpense (30,619)us-gaap_InterestExpense (33,095)us-gaap_InterestExpense
Income (loss) before income taxes 2,157,797us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (166,976)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 3,992,966us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 1,788,111us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax provision 917,879us-gaap_IncomeTaxExpenseBenefit 241,907us-gaap_IncomeTaxExpenseBenefit 1,624,038us-gaap_IncomeTaxExpenseBenefit 724,543us-gaap_IncomeTaxExpenseBenefit
Net income (loss) attributable to the Company 1,239,918us-gaap_NetIncomeLoss (408,883)us-gaap_NetIncomeLoss 2,368,928us-gaap_NetIncomeLoss 1,063,568us-gaap_NetIncomeLoss
Dividends on preferred stock 168,576us-gaap_PreferredStockDividendsIncomeStatementImpact 168,576us-gaap_PreferredStockDividendsIncomeStatementImpact 337,151us-gaap_PreferredStockDividendsIncomeStatementImpact 337,151us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income (loss) available to common stockholders 1,071,342us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (577,459)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 2,031,777us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 726,417us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings (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
Diluted (in dollars per share) $ 0.03us-gaap_EarningsPerShareDiluted $ (0.02)us-gaap_EarningsPerShareDiluted $ 0.06us-gaap_EarningsPerShareDiluted $ 0.02us-gaap_EarningsPerShareDiluted
Weighted average number of common shares        
Basic (in shares) 32,825,631us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 30,063,676us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,754,016us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 29,335,498us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 32,947,280us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 30,063,676us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,884,754us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,377,918us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Delhi Field        
Revenues        
Total revenues 7,644,831us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 4,130,236us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 11,513,433us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 8,560,047us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember
Operating costs        
Production costs 2,817,866us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 0us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 2,817,866us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 0us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember
Artificial Lift Technology        
Revenues        
Total revenues 63,236us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 189,894us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 179,092us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 331,985us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember
Operating costs        
Production costs 191,553us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 153,221us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 388,913us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 316,970us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember
Other Properties        
Revenues        
Total revenues 0us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 72,159us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 20,369us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 133,956us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember
Operating costs        
Production costs $ 9,390us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 $ 83,309us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 $ 97,412us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 $ 337,810us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember
[1] General and administrative expenses for the three months ended December 31, 2014 and 2013 included non-cash stock-based compensation expense of $245,020 and $316,422, respectively. For the corresponding six month periods, non-cash stock-based compensation expense was $488,357 and $689,860, respectively.
[2] Restructuring charges for the three and six months ended December 31, 2013 included non-cash stock-based compensation expense of $376,365 and $376,365, respectively.