Name:	erhe_AdditionalFutureMinimumCommitmentToSpendOverTwoPeriodsOfTwoYearsEach
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The additional period for the work program covered by the contract, in duration format.

No definition available.

Name:	erhe_AdditionalWorkProgramPeriod
Namespace Prefix:	erhe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Advisers' and ancillary costs related to the PSC which have been committed, paid or incurred as of the balance sheet date.

No definition available.

Name:	erhe_AdvisersAndAncillaryCostsRelatedToPsc
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Name:	erhe_AnalysisOfCostOfOilAndGasConcessionsAbstract
Namespace Prefix:	erhe_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	erhe_AnalysisOfCostsPaidPayableOrIncurredAbstract
Namespace Prefix:	erhe_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Annual training fees under the terms of the PSC, during the initial exploration term.

No definition available.

Name:	erhe_AnnualTrainingFees
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the costs of airborne geophysical survey and quality control.

No definition available.

Name:	erhe_CostsOfAirborneGeophysicalSurveyAndQualityControl
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount recovered, as of the balance sheet date, of exploration costs paid or incurred in connection with land exploration and development projects.

No definition available.

Name:	erhe_ExplorationCostsRecovered
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The commitment to incur surface fees per calendar year over the next two years as of the balance sheet date.

No definition available.

Name:	erhe_FutureCommitmentToIncurSurfaceFeesPerCalendarYearNextTwoYears
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The commitment to incur training and surface fees per calendar year over the next eight years as of the balance sheet date.

No definition available.

Name:	erhe_FutureCommitmentToIncurTrainingAndSurfaceFeesPerCalendarYearNextEightYears
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The commitment to spend under the minimum work program over additional three years after the expiration of the initial commitment as of the balance sheet date.

No definition available.

Name:	erhe_FutureCommitmentToSpendUnderMinimumWorkProgramAdditionalThreeYearsMinimum
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The commitment to spend under the minimum work program over the next five years as of the balance sheet date.

No definition available.

Name:	erhe_FutureCommitmentToSpendUnderMinimumWorkProgramNextFiveYearsMinimum
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The future minimum commitment under terms of production sharing contract ("PSC")to spend over first two years on minimum work program as of the balance sheet date.

No definition available.

Name:	erhe_FutureMinimumCommitmentToSpendOverFirstTwoYearsOnMinimumWorkProgram
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Gain recorded from sale of partial interest in Kenya concession, includes the realized gains (losses) on the sale of proved and unproved oil and gas properties.

No definition available.

Name:	erhe_GainOnSaleOfPartialInterestInKenyaConcession
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Refers to Initial consideration for transfer of interest in Kenya Block 11A to the Kenya farm-out partner.

No definition available.

Name:	erhe_InitialConsiderationForTransferOfInterestInKenyaBlock11AToKenyaFarmOutPartner
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Legal fees and costs for the drafting and negotiation of the PSC, as provided in PSC which have been committed, paid or incurred as of the balance sheet date.

No definition available.

Name:	erhe_LegalFeesAndCostsForDraftingAndNegotiationOfPscAsProvidedInPsc
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Meeting fees and other costs committed, paid or incurred as of the balance sheet date.

No definition available.

Name:	erhe_MeetingFeesAndOtherCosts
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

The minimum period for the work program in duration format.

No definition available.

Name:	erhe_MinimumWorkProgramPeriod
Namespace Prefix:	erhe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents number of blocks covered under the contract.

No definition available.

Name:	erhe_NumberOfBlocksCoveredByContract
Namespace Prefix:	erhe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents number of blocks which would be relinquished under the contract.

No definition available.

Name:	erhe_NumberOfBlocksToBeRelinquished
Namespace Prefix:	erhe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Amount, as of the balance sheet date, of concession fees paid or incurred in connection with land exploration and development projects.

No definition available.

Name:	erhe_OilAndGasConcessionFees
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount recovered, as of the balance sheet date, of concession fees paid or incurred in connection with land exploration and development projects.

No definition available.

Name:	erhe_OilAndGasConcessionFeesRecovered
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The option to acquire paid working interest in the blocks.

No definition available.

Name:	erhe_OptionToAcquirePaidWorkingInterest
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The participating interest transferred to others as of the balance sheet date.

No definition available.

Name:	erhe_ParticipatingInterestSTransferred
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The period for initial exploration term under production sharing contract (PSC).

No definition available.

Name:	erhe_PeriodForInitialExplorationTermUnderProductionSharingContract
Namespace Prefix:	erhe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The period in which the surface fees must be incurred by the contract, in duration format.

No definition available.

Name:	erhe_PeriodOfSurfaceFee
Namespace Prefix:	erhe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The percentage of right to receive signature free bonus interest.

No definition available.

Name:	erhe_RightToReceiveWorkingInterestSignatureFreeBonus
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The signature bonus commitment paid or incurred as of the balance sheet date.

No definition available.

Name:	erhe_SignatureBonusCommitmentPaidOrIncurred
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Meeting fees and other costs committed, paid or incurred as of the balance sheet date.

No definition available.

Name:	erhe_TotalCostsPaidPayableOrIncurred
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Amount recovered, as of the balance sheet date, of training and surface fees paid or incurred in connection with land exploration and development projects.

No definition available.

Name:	erhe_TrainingAndSurfaceFeesRecovered
Namespace Prefix:	erhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-10.(c)(7)(ii))

-URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 3(ii)(A)

-Article 4

Name:	us-gaap_AcquisitionCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	us-gaap_StatementGeographicalAxis=erhe_ChadConcessionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementGeographicalAxis=erhe_DrstpConcessionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementGeographicalAxis=erhe_KenyaConcessionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: