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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	$ 5,988,000us-gaap_LongTermInvestments			$ 5,900,000us-gaap_LongTermInvestments
Equity in income (loss) of affiliates	88,000us-gaap_IncomeLossFromEquityMethodInvestments	(147,000)us-gaap_IncomeLossFromEquityMethodInvestments
Revenues-sale of interest in leasehold land, net	1,032,000brn_SaleOfInterestInLeaseholdLandNet	120,000brn_SaleOfInterestInLeaseholdLandNet
Investment in land
Summary of investments
Total investments	1,192,000us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember			1,192,000us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Number of residential parcels owned	1us-gaap_NumberOfRealEstateProperties / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Purchase or sales price					1,250,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Investment in land development partnerships
Summary of investments
Total investments	4,746,000us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember			4,658,000us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember
Number of limited liability limited partnerships formed			2brn_NumberOfLimitedLiabilityLimitedPartnershipsFormed / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember
Equity in income (loss) of affiliates	88,000us-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	324,000us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember
Bonds issued by the surety	4,830,000us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember
Maximum loss exposure	9,576,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember
Summarized financial information
Revenue	4,626,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember	269,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember
Gross profit	1,427,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember	211,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember
Net earnings (loss)	420,000us-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			5,140,000us-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	50,000us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_LandInterestMember			50,000us-gaap_LongTermInvestments / us-gaap_InvestmentTypeAxis = brn_LandInterestMember
Area of land (in acres)	1,000us-gaap_AreaOfLand / us-gaap_InvestmentTypeAxis = brn_LandInterestMember
Kaupulehu Developments
Summary of investments
Area of land (in acres)	870us-gaap_AreaOfLand / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember
Number of development increments	2brn_NumberOfDevelopmentIncrements / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember
Sale of interest in leasehold land: Proceeds	1,200,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember	140,000brn_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	$ 1,032,000brn_SaleOfInterestInLeaseholdLandNet / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember	$ 120,000brn_SaleOfInterestInLeaseholdLandNet / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember

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