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Accrued Liabilities and Other (Details) (USD $)	Mar. 31, 2015	Jun. 30, 2014
Other Liabilities, Current [Abstract]
Accrued incentive and other compensation	$ 566,465us-gaap_AccruedSalariesCurrentAndNoncurrent	$ 1,358,653us-gaap_AccruedSalariesCurrentAndNoncurrent
Accrued restructuring charges	0us-gaap_RestructuringReserveCurrent	530,412us-gaap_RestructuringReserveCurrent
Officer retirement costs	0epm_AccruedRetirementObligation	288,258epm_AccruedRetirementObligation
Asset retirement obligations due within one year	10,219us-gaap_AssetRetirementObligationCurrent	146,703us-gaap_AssetRetirementObligationCurrent
Accrued royalties	69,344us-gaap_AccruedRoyaltiesCurrent	89,179us-gaap_AccruedRoyaltiesCurrent
Accrued franchise taxes	94,473us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent	87,575us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Other accrued liabilities	49,191us-gaap_OtherAccruedLiabilitiesCurrent	57,224us-gaap_OtherAccruedLiabilitiesCurrent
Accrued liabilities and other	$ 789,692us-gaap_OtherLiabilitiesCurrent	$ 2,558,004us-gaap_OtherLiabilitiesCurrent

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Accrued Retirement Obligation

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Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided.

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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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-Name Staff Accounting Bulletin (SAB)

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