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SUBSEQUENT EVENTS (Details) (USD $) | 3 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jan. 30, 2015 item | Jan. 31, 2015
Kaupulehu Developments |  |  |  |
Subsequent events |  |  |  |
Percentage of sales payment received | $ 1,200,000 brn_ProceedsFromSaleOfInterestInLeaseholdLandGross / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember | $ 140,000 brn_ProceedsFromSaleOfInterestInLeaseholdLandGross / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember |  |
Subsequent event | Oil and salt water spill in Alberta |  |  |  |
Subsequent events |  |  |  |
Total estimated clean up expenses |  |  |  | 880,000 brn_TotalEstimatedCleanUpExpense / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_DamageFromFireExplosionOrOtherHazardMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Working interest (as a percent) |  |  |  | 58.00%brn_WorkingInterestPercentage / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_DamageFromFireExplosionOrOtherHazardMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Insurance deductible |  |  |  | 220,000 brn_InsuranceDeductible / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_DamageFromFireExplosionOrOtherHazardMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent event | Investment in land development partnerships | Phase II | Kaupulehu Developments |  |  |  |
Subsequent events |  |  |  |
Percentage of sales payment received |  |  | $ 640,000 brn_ProceedsFromSaleOfInterestInLeaseholdLandGross / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember / brn_PhaseAxis = brn_PhaseTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Number of lots sold in Increment I |  |  | 2 brn_NumberOfSingleFamilyLotsSold / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember / brn_PhaseAxis = brn_PhaseTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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