Name:	epsn_HedgingPercentageOnProductionOfNaturalGasFirstTwelveMonths
Namespace Prefix:	epsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The percentage of projected production of natural gas should be hedged under the agreement for the succeeding six months after Company’s utilization exceeds 25%.

No definition available.

Name:	epsn_HedgingPercentageOnProductionOfNaturalGasSucceedingSixMonths
Namespace Prefix:	epsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

The minimum utilization percentage of production for maintaining acceptable commodity hedging agreements.

No definition available.

Name:	epsn_MinimumUtilizationPercentageNaturalGasProduction
Namespace Prefix:	epsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The scenario option of percentage of reserve to be maintained on borrowing base of credit facility.

No definition available.

Name:	epsn_RequiredReserveValuePercentageOnBorrowingBaseOfCreditFacilityScenarioOption
Namespace Prefix:	epsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The percentage of reserve to be maintained on value of proved oil and gas properties.

No definition available.

Name:	epsn_RequiredReserveValuePercentageOnProvedOilAndGasProperties
Namespace Prefix:	epsn_
Data Type:	num:percentItemType
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.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
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.

No definition available.

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: