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RELATED PARTY TRANSACTIONS (Details) (Kaupulehu Developments, USD $) | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Related party transactions |  |
Percentage of sales payment received | $ 1,200,000 brn_ProceedsFromSaleOfInterestInLeaseholdLandGross | $ 140,000 brn_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 | $ 1,200,000 brn_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 | 6 brn_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 | 2 brn_NumberOfSingleFamilyLotsSold / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember / brn_PhaseAxis = brn_PhaseTwoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = brn_KDKaupulehuLLLPMember |

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- Definition The gross cash inflow from the sale of interest in leasehold land. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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