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INVESTMENTS (Details) (USD $) | 3 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Nov. 27, 2013 item | Sep. 30, 2014 | Oct. 31, 2014
Summary of investments |  |  |  |  |
Total investments | $ 5,988,000 us-gaap_LongTermInvestments |  |  | $ 5,900,000 us-gaap_LongTermInvestments |
Equity in income (loss) of affiliates | 88,000 us-gaap_IncomeLossFromEquityMethodInvestments | (147,000)us-gaap_IncomeLossFromEquityMethodInvestments |  |  |
Revenues-sale of interest in leasehold land, net | 1,032,000 brn_SaleOfInterestInLeaseholdLandNet | 120,000 brn_SaleOfInterestInLeaseholdLandNet |  |  |
Investment in land |  |  |  |  |
Summary of investments |  |  |  |  |
Total investments | 1,192,000 us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember |  |  | 1,192,000 us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember |
Number of residential parcels owned | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember |  |  |  |
Purchase or sales price |  |  |  |  | 1,250,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Investment in land development partnerships |  |  |  |  |
Summary of investments |  |  |  |  |
Total investments | 4,746,000 us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember |  |  | 4,658,000 us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember |
Number of limited liability limited partnerships formed |  |  | 2 brn_NumberOfLimitedLiabilityLimitedPartnershipsFormed / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember |  |
Equity in income (loss) of affiliates | 88,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember | (147,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember |  |  |
Basis difference between the underlying equity in net assets of the investee and the carrying value of the entity's investment | 324,000 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember |  |  |  |
Bonds issued by the surety | 4,830,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember |  |  |  |
Maximum loss exposure | 9,576,000 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember |  |  |  |
Summarized financial information |  |  |  |  |
Revenue | 4,626,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember | 269,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember |  |  |
Gross profit | 1,427,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember | 211,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember |  |  |
Net earnings (loss) | 420,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember | (381,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember |  |  |
Investment in land development partnerships | KD Kukio Resorts, LLLP, KD Maniniowali, LLLP, and KD Kaupulehu, LLLP |  |  |  |  |
Summary of investments |  |  |  |  |
Ownership interest acquired, aggregate cost |  |  | 5,140,000 us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = brn_IndirectlyAcquiredInterestMember |  |
Investment in land development partnerships | KD Kukio Resorts, LLLP |  |  |  |  |
Summary of investments |  |  |  |  |
Ownership interest acquired (as a percent) |  |  | 19.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = brn_KDKukioResortsLLLPMember |  |
Investment in land development partnerships | KD Maniniowali, LLLP |  |  |  |  |
Summary of investments |  |  |  |  |
Ownership interest acquired (as a percent) |  |  | 19.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = brn_KDManiniowaliLLLPMember |  |
Investment in land development partnerships | KD Kaupulehu, LLLP |  |  |  |  |
Summary of investments |  |  |  |  |
Ownership interest acquired (as a percent) |  |  | 19.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = brn_KDKaupulehuLLLPMember |  |
Investment in leasehold land interest - Lot 4C |  |  |  |  |
Summary of investments |  |  |  |  |
Total investments | 50,000 us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_LandInterestMember |  |  | 50,000 us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_LandInterestMember |
Area of land (in acres) | 1,000 us-gaap_AreaOfLand / us-gaap_InvestmentTypeAxis = brn_LandInterestMember |  |  |  |
Kaupulehu Developments |  |  |  |  |
Summary of investments |  |  |  |  |
Area of land (in acres) | 870 us-gaap_AreaOfLand / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember |  |  |  |
Number of development increments | 2 brn_NumberOfDevelopmentIncrements / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember |  |  |  |
Sale of interest in leasehold land: Proceeds | 1,200,000 brn_ProceedsFromSaleOfInterestInLeaseholdLandGross / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember | 140,000 brn_ProceedsFromSaleOfInterestInLeaseholdLandGross / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember |  |  |
Sale of interest in leasehold land: Fees | (168,000)brn_FeesRelatedToSaleOfInterestInLeaseholdLand / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember | (20,000)brn_FeesRelatedToSaleOfInterestInLeaseholdLand / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember |  |  |
Revenues-sale of interest in leasehold land, net | $ 1,032,000 brn_SaleOfInterestInLeaseholdLandNet / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember | $ 120,000 brn_SaleOfInterestInLeaseholdLandNet / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember |  |  |

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