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Consolidated Condensed Statements of Operations (USD $)
 3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Revenues        
Total revenues $ 7,064,689us-gaap_SalesRevenueNet $ 4,337,006us-gaap_SalesRevenueNet $ 18,777,583us-gaap_SalesRevenueNet $ 13,362,994us-gaap_SalesRevenueNet
Operating costs        
Depreciation, depletion and amortization 1,138,502us-gaap_DepreciationDepletionAndAmortization 311,815us-gaap_DepreciationDepletionAndAmortization 2,425,609us-gaap_DepreciationDepletionAndAmortization 948,656us-gaap_DepreciationDepletionAndAmortization
Accretion of discount on asset retirement obligations 10,924us-gaap_AssetRetirementObligationAccretionExpense 9,631us-gaap_AssetRetirementObligationAccretionExpense 23,697us-gaap_AssetRetirementObligationAccretionExpense 34,977us-gaap_AssetRetirementObligationAccretionExpense
General and administrative expenses 1,467,782us-gaap_GeneralAndAdministrativeExpense [1] 2,304,397us-gaap_GeneralAndAdministrativeExpense [1] 4,578,876us-gaap_GeneralAndAdministrativeExpense [1] 6,875,430us-gaap_GeneralAndAdministrativeExpense [1]
Restructuring charges 0us-gaap_RestructuringCharges [2] 0us-gaap_RestructuringCharges [2] (5,431)us-gaap_RestructuringCharges [2] 1,332,186us-gaap_RestructuringCharges [2]
Total operating costs 5,818,699us-gaap_OperatingExpenses 2,979,472us-gaap_OperatingExpenses 13,528,433us-gaap_OperatingExpenses 10,199,658us-gaap_OperatingExpenses
Income from operations 1,245,990us-gaap_OperatingIncomeLoss 1,357,534us-gaap_OperatingIncomeLoss 5,249,150us-gaap_OperatingIncomeLoss 3,163,336us-gaap_OperatingIncomeLoss
Other        
Interest income 7,401us-gaap_InvestmentIncomeInterest 7,383us-gaap_InvestmentIncomeInterest 27,826us-gaap_InvestmentIncomeInterest 22,787us-gaap_InvestmentIncomeInterest
Interest (expense) (24,625)us-gaap_InterestExpense (17,605)us-gaap_InterestExpense (55,244)us-gaap_InterestExpense (50,700)us-gaap_InterestExpense
Income before income taxes 1,228,766us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 1,347,312us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 5,221,732us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 3,135,423us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax provision 494,180us-gaap_IncomeTaxExpenseBenefit 423,612us-gaap_IncomeTaxExpenseBenefit 2,118,218us-gaap_IncomeTaxExpenseBenefit 1,148,155us-gaap_IncomeTaxExpenseBenefit
Net income attributable to the Company 734,586us-gaap_NetIncomeLoss 923,700us-gaap_NetIncomeLoss 3,103,514us-gaap_NetIncomeLoss 1,987,268us-gaap_NetIncomeLoss
Dividends on preferred stock 168,575us-gaap_PreferredStockDividendsIncomeStatementImpact 168,575us-gaap_PreferredStockDividendsIncomeStatementImpact 505,726us-gaap_PreferredStockDividendsIncomeStatementImpact 505,726us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income available to common stockholders 566,011us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 755,125us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 2,597,788us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 1,481,542us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per common share        
Basic (in dollars per share) $ 0.02us-gaap_EarningsPerShareBasic $ 0.02us-gaap_EarningsPerShareBasic $ 0.08us-gaap_EarningsPerShareBasic $ 0.05us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.02us-gaap_EarningsPerShareDiluted $ 0.02us-gaap_EarningsPerShareDiluted $ 0.08us-gaap_EarningsPerShareDiluted $ 0.05us-gaap_EarningsPerShareDiluted
Weighted average number of common shares        
Basic (in shares) 32,861,001us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,358,163us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,789,157us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 30,328,344us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 32,958,218us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,732,049us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,909,981us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,503,460us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Delhi field        
Revenues        
Total revenues 7,039,868us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 4,185,156us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 18,553,301us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 12,745,203us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember
Operating costs        
Production costs 2,932,946us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 0us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 5,750,812us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember		 0us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_DelhiFieldPropertyMember
Artificial lift technology        
Revenues        
Total revenues 24,821us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 151,052us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 203,913us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 483,037us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember
Operating costs        
Production costs 267,906us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 209,742us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 656,819us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember		 526,712us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= epm_ArtificialLiftTechnologyMember
Other properties        
Revenues        
Total revenues 0us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 798us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 20,369us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 134,754us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember
Operating costs        
Production costs $ 639us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 $ 143,887us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 $ 98,051us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember		 $ 481,697us-gaap_ExplorationAndProductionCosts
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember
[1] General and administrative expenses for the three months ended March 31, 2015 and 2014 included non-cash stock-based compensation expense of $227,507 and $444,981, respectively. For the corresponding nine month periods, non-cash stock-based compensation expense was $715,864 and $1,134,841, respectively.
[2] Restructuring charges for the nine months ended March 31, 2014 included non-cash stock-based compensation expense of $376,365. For the three months ended March 31, 2014, restructuring charges contained no stock-based compensation expense.