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RELATED PARTY TRANSACTIONS (Details) (Kaupulehu Developments, USD $)
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Related party transactions    
Percentage of sales payment received $ 1,200,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross $ 140,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross
KD Kaupulehu, LLLP | Investment in land development partnerships
    
Related party transactions    
Ownership interest acquired (as a percent) 19.60%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= brn_KDKaupulehuLLLPMember		  
Percentage of sales payment received $ 1,200,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= brn_KDKaupulehuLLLPMember		  
KD Kaupulehu, LLLP | Investment in land development partnerships | Phase I
    
Related party transactions    
Number of lots sold in Increment I 6brn_NumberOfSingleFamilyLotsSold
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ brn_PhaseAxis
= brn_PhaseOneMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= brn_KDKaupulehuLLLPMember		  
KD Kaupulehu, LLLP | Investment in land development partnerships | Phase II
    
Related party transactions    
Number of lots sold in Increment I 2brn_NumberOfSingleFamilyLotsSold
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ brn_PhaseAxis
= brn_PhaseTwoMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= brn_KDKaupulehuLLLPMember