Name:	epsn_CurrentRatio
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The ratio should maintain among debt and equity which will assesses the ability of the company to meet its financial obligations after adjusted for interest, taxes and non-cash amounts.

No definition available.

Name:	epsn_LeverageRatio
Namespace Prefix:	epsn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Percentage of hedging anticipated production from PDP reserves.

No definition available.

Name:	epsn_PercentageOfHedgingAnticipatedProductionFromPdpReserves
Namespace Prefix:	epsn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of utilization of borrowing base.

No definition available.

Name:	epsn_PercentageOfUtilizationOfBorrowingBase
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Data Type:	dtr-types:percentItemType
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Period Type:	duration

Rolling term for calculation of anticipated production from PDP reserves

No definition available.

Name:	epsn_RollingTermForCalculationOfAnticipatedProductionFromPdpReserves
Namespace Prefix:	epsn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Indicates type of variable interest rate of investment.

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Name:	us-gaap_InvestmentVariableInterestRateTypeExtensibleEnumeration
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Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
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-Subparagraph (SX 210.4-08(f))
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