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Property and Equipment (Details) (USD $)
6 Months Ended
Dec. 31, 2014
well
Jun. 30, 2014
Property, Plant and Equipment [Abstract]    
Installation costs of artificial lift technology $ 217,934us-gaap_CostOfServicesOilAndGas  
Percentage of net profits from production 25.00%epm_OilAndGasContractsPercentageofNetProfitsfromProductionReceivedFromThirdPartyCustomer  
Additional depreciation 267,326epm_CostOfServicesDepreciationRelatedToRemovedandReinstalledWell  
Number of wells installed with artificial lift technology 2epm_OilandGasNumberofWellsInstalledwithArtificialLiftTechnologyforThirdPartyCustomer  
Number of wells removed and installed with artificial lift technology 3epm_OilandGasNumberofWellsRemovedandInstalledwithArtificialLiftTechnologyforThirdPartyCustomer  
Oil and natural gas properties    
Property costs subject to amortization 48,812,257us-gaap_OilAndGasPropertyFullCostMethodGross 47,166,282us-gaap_OilAndGasPropertyFullCostMethodGross
Less: Accumulated depreciation, depletion, and amortization (10,275,524)us-gaap_OilAndGasPropertyFullCostMethodDepletion (9,344,212)us-gaap_OilAndGasPropertyFullCostMethodDepletion
Oil and natural gas property and equipment, net (full-cost method of accounting) 38,536,733us-gaap_OilAndGasPropertyFullCostMethodNet 37,822,070us-gaap_OilAndGasPropertyFullCostMethodNet
Other property and equipment    
Furniture, fixtures and office equipment, at cost 286,820us-gaap_PropertyPlantAndEquipmentOther 343,178us-gaap_PropertyPlantAndEquipmentOther
Artificial lift technology equipment, at cost 595,877epm_PropertyPlantAndEquipmentOilAndGasTechnologyEquipmentGross 377,943epm_PropertyPlantAndEquipmentOilAndGasTechnologyEquipmentGross
Less: Accumulated depreciation (549,696)us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation (296,294)us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation
Other property and equipment, net $ 333,001us-gaap_PropertyPlantAndEquipmentOtherNet $ 424,827us-gaap_PropertyPlantAndEquipmentOtherNet