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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 $ 1,200,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
$ 140,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
   
Subsequent event | Oil and salt water spill in Alberta        
Subsequent events        
Total estimated clean up expenses       880,000brn_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       220,000brn_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     $ 640,000brn_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     2brn_NumberOfSingleFamilyLotsSold
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ brn_PhaseAxis
= brn_PhaseTwoMember
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= us-gaap_SubsequentEventMember