2.4.0.8090500 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)truefalsefalse1false USDfalsefalse$c20121001to20130630_StatementGeographicalAxis_ChadConcessionMemberhttp://www.sec.gov/CIK0000799235duration2012-10-01T00:00:002013-06-30T00:00:00U004Standardhttp://www.xbrl.org/2003/instancepurexbrli0U002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse1false truefalsec20130630_LitigationStatusAxis_Jdz5Memberhttp://www.sec.gov/CIK0000799235instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseJDZ 5 [Member]us-gaap_LitigationStatusAxisxbrldihttp://xbrl.org/2006/xbrldierhe_Jdz5Memberus-gaap_LitigationStatusAxisexplicitMemberU004Standardhttp://www.xbrl.org/2003/instancepurexbrli0nanafalse0JDZ 5 [Member]2true 3us-gaap_LossContingenciesLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loss Contingencies [Line Items]3false 4erhe_WorkingInterestAwardedInMiningConcessionserhe_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.150.15falsefalsefalsenum:percentItemTypepureThe percentage of working interest awarded in mining concessions.No definition available.false0Working interest awarded in mining concessions (in hundredths)4false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2false truefalsec20130630_LitigationStatusAxis_Jdz6Memberhttp://www.sec.gov/CIK0000799235instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseJDZ 6 [Member]us-gaap_LitigationStatusAxisxbrldihttp://xbrl.org/2006/xbrldierhe_Jdz6Memberus-gaap_LitigationStatusAxisexplicitMemberU004Standardhttp://www.xbrl.org/2003/instancepurexbrli0nanafalse0JDZ 6 [Member]5true 3us-gaap_LossContingenciesLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loss Contingencies [Line Items]6false 4erhe_WorkingInterestAwardedInMiningConcessionserhe_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.150.15falsefalsefalsenum:percentItemTypepureThe percentage of working interest awarded in mining concessions.No definition available.false0Working interest awarded in mining concessions (in hundredths)7false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse3false USDtruefalse$c20121001to20130630_StatementGeographicalAxis_ChadConcessionMemberhttp://www.sec.gov/CIK0000799235duration2012-10-01T00:00:002013-06-30T00:00:00falsefalseChad Concession [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldierhe_ChadConcessionMemberus-gaap_StatementGeographicalAxisexplicitMemberU004Standardhttp://www.xbrl.org/2003/instancepurexbrli0U002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Chad Concession [Member]8true 3us-gaap_LossContingenciesLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loss Contingencies [Line Items]9false 4erhe_SignatureBonusCommitmenterhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse60000006000000USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe total signature commitment under the production sharing contract paid during the period.No definition available.false2Signature bonus commitment10false 4erhe_NumberOfBlocksUnderProductionSharingContracterhe_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse33falsefalsefalsexbrli:integerItemTypeintegerRepresents number of blocks under production sharing contract.No definition available.false0Number of blocks under production sharing contract11false 4erhe_SignatureBonusCommitmentPaidOrIncurrederhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse20000002000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe signature bonus commitment paid or incurred as of the balance sheet date.No definition available.false2Signature bonus commitment paid or incurred12false 4us-gaap_LegalFeesus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse480000480000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 false2Legal fees13false 4erhe_EnvironmentalCosterhe_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse3940039400USD$falsefalsefalsexbrli:monetaryItemTypemonetaryRefers to environmental cost as provided for in the production sharing contract ("PSC").No definition available.false2Environmental cost14false 4us-gaap_ProfessionalFeesus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse450339450339USD$falsefalsefalsexbrli:monetaryItemTypemonetaryA fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.2(a),(b),(c),(d)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section 45 -Paragraph 3 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6488370&loc=d3e13550-115849 false2Professional fees15false 4erhe_AccruedFinalInstallmentOfSignatureBonusCommitmenterhe_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse40000004000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents accrued final installment of the signature bonus commitment on particular date.No definition available.false2Accrued final installment of the signature bonus commitment16false 4erhe_FutureCommitmentToSpendUnderMinimumWorkProgramNextFiveYearsMinimumerhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1500000015000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe commitment to spend under the minimum work program over the next five years as of the balance sheet date.No definition available.false2Future commitment to spend under minimum work program next five years minimum17false 4erhe_FutureCommitmentToSpendUnderMinimumWorkProgramAdditionalThreeYearsMinimumerhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse10000001000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe commitment to spend under the minimum work program over additional three years after the expiration of the initial commitment as of the balance sheet date.No definition available.false2Future commitment to spend under minimum work program additional three years minimum18false 4erhe_FutureCommitmentToIncurSurfaceFeesPerCalendarYearNextEightYearserhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse2700027000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe commitment to incur surface fees per calendar year over the next eight years as of the balance sheet date.No definition available.false2Future commitment to incur surface fees per calendar year next eight years19false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse4false USDtruefalse$c20130630_StatementGeographicalAxis_ChadConcessionMember_TransmittalOfApprovalLawPeriodAxis_TransmittalOfApprovalLawByChadToErhcMemberhttp://www.sec.gov/CIK0000799235instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseChad Concession [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldierhe_ChadConcessionMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseTransmittal of an Approval Law by Chad to ERHC [Member]erhe_TransmittalOfApprovalLawPeriodAxisxbrldihttp://xbrl.org/2006/xbrldierhe_TransmittalOfApprovalLawByChadToErhcMembererhe_TransmittalOfApprovalLawPeriodAxisexplicitMemberU002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Chad Concession [Member] | Transmittal of an Approval Law by Chad to ERHC [Member]20true 3us-gaap_LossContingenciesLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loss Contingencies [Line Items]21false 4erhe_SignatureBonusCommitmenterhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10000001000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe total signature commitment under the production sharing contract paid during the period.No definition available.false2Signature bonus commitment22false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse5false USDtruefalse$c20130630_StatementGeographicalAxis_ChadConcessionMember_TransmittalOfApprovalLawPeriodAxis_TransmittalOfApprovalLawByChadToErhcDueWithIn90DaysMemberhttp://www.sec.gov/CIK0000799235instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseChad Concession [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldierhe_ChadConcessionMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseTransmittal of Approval Law by Chad to ERHC Due With in 90 Days [Member]erhe_TransmittalOfApprovalLawPeriodAxisxbrldihttp://xbrl.org/2006/xbrldierhe_TransmittalOfApprovalLawByChadToErhcDueWithIn90DaysMembererhe_TransmittalOfApprovalLawPeriodAxisexplicitMemberU002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Chad Concession [Member] | Transmittal of Approval Law by Chad to ERHC Due With in 90 Days [Member]23true 3us-gaap_LossContingenciesLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loss Contingencies [Line Items]24false 4erhe_SignatureBonusCommitmenterhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse40000004000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe total signature commitment under the production sharing contract paid during the period.No definition available.false2Signature bonus commitment25false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse6false USDtruefalse$c20130630_StatementGeographicalAxis_ChadConcessionMember_TransmittalOfApprovalLawPeriodAxis_TransmittalOfApprovalLawByChadToErhcDueOn120DaysMemberhttp://www.sec.gov/CIK0000799235instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseChad Concession [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldierhe_ChadConcessionMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseTransmittal of Approval Law by Chad to ERHC Due On 120 Days [Member]erhe_TransmittalOfApprovalLawPeriodAxisxbrldihttp://xbrl.org/2006/xbrldierhe_TransmittalOfApprovalLawByChadToErhcDueOn120DaysMembererhe_TransmittalOfApprovalLawPeriodAxisexplicitMemberU002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Chad Concession [Member] | Transmittal of Approval Law by Chad to ERHC Due On 120 Days [Member]26true 3us-gaap_LossContingenciesLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loss Contingencies [Line Items]27false 4erhe_SignatureBonusCommitmenterhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10000001000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe total signature commitment under the production sharing contract paid during the period.No definition available.false2Signature bonus commitment28false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse7false USDtruefalse$c20121001to20130630_StatementGeographicalAxis_KenyaConcessionMemberhttp://www.sec.gov/CIK0000799235duration2012-10-01T00:00:002013-06-30T00:00:00falsefalseKenya Concession [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldierhe_KenyaConcessionMemberus-gaap_StatementGeographicalAxisexplicitMemberU002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Kenya Concession [Member]29true 3us-gaap_LossContingenciesLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loss Contingencies [Line Items]30false 4erhe_SignatureBonusCommitmenterhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse310000310000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe total signature commitment under the production sharing contract paid during the period.No definition available.false2Signature bonus commitment31false 4erhe_FutureMinimumCommitmentToSpendOverFirstTwoYearsOnMinimumWorkProgramerhe_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1025000010250000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe future minimum commitment under terms of production sharing contract ("PSC")to spend over first two years on minimum work program as of the balance sheet date.No definition available.false2Future minimum commitment to spend over first two years on minimum work program32false 4erhe_AdditionalFutureMinimumCommitmentToSpendOverTwoPeriodsOfTwoYearsEacherhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse3000000030000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe commitment to spend under the minimum work program over additional two periods of two years each the expiration of the initial commitment as of the balance sheet date.No definition available.false2Additional future minimum commitment to spend over two periods of two years each33false 4erhe_PeriodForInitialExplorationTermUnderProductionSharingContracterhe_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse002 yearsfalsefalsefalsexbrli:durationItemTypenaThe period for initial exploration term under production sharing contract (PSC).No definition available.false0Period for initial exploration term under production sharing contract34false 4erhe_FutureCommitmentToIncurSurfaceFeesPerCalendarYearNextTwoYearserhe_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse5400054000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe commitment to incur surface fees per calendar year over the next two years as of the balance sheet date.No definition available.false2Future commitment to incur surface fees per calendar year next two years35false 4erhe_AnnualTrainingFeeserhe_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse175000175000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAnnual training fees under the terms of the PSC, during the initial exploration term.No definition available.false2Annual training fees36false 4erhe_TrainingAndSurfaceFeeserhe_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse229569229569USD$falsetruefalsexbrli:monetaryItemTypemonetaryRefers to training and surface fees as provided for in the production sharing contract ("PSC").No definition available.false2Training and surface feesfalseCOMMITMENTS AND CONTINGENCIES (Details) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://erhc.com/role/CommitmentsAndContingenciesDetails136