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INVESTMENTS (Details) (USD $)
 12 Months Ended 0 Months Ended 10 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Nov. 27, 2013
item
Sep. 30, 2014
Jul. 25, 2014
Summary of investments          
Total investments $ 5,900,000us-gaap_LongTermInvestments $ 2,381,000us-gaap_LongTermInvestments   $ 5,900,000us-gaap_LongTermInvestments  
Equity in loss of affiliates (482,000)us-gaap_IncomeLossFromEquityMethodInvestments        
Revenues sale of interest in leasehold land, net 636,000brn_SaleOfInterestInLeaseholdLandNet 282,000brn_SaleOfInterestInLeaseholdLandNet      
Additional payment to be received 102,000brn_AdditionalPaymentToBeReceivedFromSaleOfOtherInvestmentInterest     102,000brn_AdditionalPaymentToBeReceivedFromSaleOfOtherInvestmentInterest  
Gain on sale of investments 3,399,000us-gaap_GainOnSaleOfInvestments        
Gain on sale of investments relating to Non-Controlling Interest 666,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (109,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest      
Investment in land          
Summary of investments          
Total investments 1,192,000us-gaap_LongTermInvestments
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember		 2,331,000us-gaap_LongTermInvestments
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember		   1,192,000us-gaap_LongTermInvestments
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember		  
Number of residential parcels owned 2us-gaap_NumberOfRealEstateProperties
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember		     2us-gaap_NumberOfRealEstateProperties
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember		  
Number of residential parcels held for investment 1brn_NumberOfRealEstatePropertiesHeldForInvestment
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember		     1brn_NumberOfRealEstatePropertiesHeldForInvestment
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember		  
Investment in land development partnerships          
Summary of investments          
Total investments 4,658,000us-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 loss of affiliates       (482,000)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		     324,000us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember		  
Bonds issued by the surety 5,400,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember		     5,400,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember		  
Maximum loss exposure 10,058,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember		     10,058,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember		  
Summarized financial information          
Revenue       5,114,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember		  
Gross profit       2,058,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember		  
Net loss       (1,614,000)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		   50,000us-gaap_LongTermInvestments
/ us-gaap_InvestmentTypeAxis
= brn_LandInterestMember		  
Area of land (in acres) 1,000us-gaap_AreaOfLand
/ us-gaap_InvestmentTypeAxis
= brn_LandInterestMember		     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		     870us-gaap_AreaOfLand
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		  
Number of development increments 2brn_NumberOfDevelopmentIncrements
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		        
Sale of interest in leasehold land: Proceeds 740,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		 300,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		      
Sale of interest in leasehold land: Fees (104,000)brn_FeesRelatedToSaleOfInterestInLeaseholdLand
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		 (18,000)brn_FeesRelatedToSaleOfInterestInLeaseholdLand
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		      
Revenues sale of interest in leasehold land, net 636,000brn_SaleOfInterestInLeaseholdLandNet
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		 282,000brn_SaleOfInterestInLeaseholdLandNet
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		      
Ownership interest in subsidiaries (as a percent) 77.60%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		        
Number of single-family lots planned in Increment I 80brn_NumberOfSingleFamilyLotsPlannedInIncrementI
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		        
Kaupulehu Developments | Phase I          
Summary of investments          
Number of lots sold in Increment I 32brn_NumberOfSingleFamilyLotsSold
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ brn_PhaseAxis
= brn_PhaseOneMember		        
Number of single-family lots planned in Increment I 38brn_NumberOfSingleFamilyLotsPlannedInIncrementI
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ brn_PhaseAxis
= brn_PhaseOneMember		        
Kaupulehu Developments | Phase II          
Summary of investments          
Number of lots sold in Increment I 3brn_NumberOfSingleFamilyLotsSold
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ brn_PhaseAxis
= brn_PhaseTwoMember		        
Number of single-family lots planned in Increment I 42brn_NumberOfSingleFamilyLotsPlannedInIncrementI
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ brn_PhaseAxis
= brn_PhaseTwoMember		        
Kaupulehu Developments | Aggregate gross proceeds up to $100,000,000          
Summary of investments          
Payments entitled to be received from KD I as percentage of gross receipts from KD I's sales of single-family residential lots in Increment I 9.00%brn_PaymentsEntitledToBeReceivedAsPercentageOfGrossProceedsFromSaleOfSingleFamilyLotsInIncrementI
/ brn_AggregateGrossProceedsFromSaleOfResidentialLotsRangeAxis
= brn_AggregateGrossProceedsRangeOneMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		        
Kaupulehu Developments | Aggregate gross proceeds greater than $100,000,000 up to $300,000,000          
Summary of investments          
Payments entitled to be received from KD I as percentage of gross receipts from KD I's sales of single-family residential lots in Increment I 10.00%brn_PaymentsEntitledToBeReceivedAsPercentageOfGrossProceedsFromSaleOfSingleFamilyLotsInIncrementI
/ brn_AggregateGrossProceedsFromSaleOfResidentialLotsRangeAxis
= brn_AggregateGrossProceedsRangeTwoMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		        
Kaupulehu Developments | Aggregate gross proceeds in excess of $300,000,000          
Summary of investments          
Payments entitled to be received from KD I as percentage of gross receipts from KD I's sales of single-family residential lots in Increment I 14.00%brn_PaymentsEntitledToBeReceivedAsPercentageOfGrossProceedsFromSaleOfSingleFamilyLotsInIncrementI
/ brn_AggregateGrossProceedsFromSaleOfResidentialLotsRangeAxis
= brn_AggregateGrossProceedsRangeThreeMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		        
Kaupulehu Developments | Minimum | Aggregate gross proceeds greater than $100,000,000 up to $300,000,000          
Summary of investments          
Gross proceeds from sale of Increment I single-family lots on which payments to be received from KD I is based 100,000,000brn_AggregateGrossProceedsFromSaleOfIncrementISingleFamilyLotsForCalculatingPaymentsEntitledToBeReceived
/ brn_AggregateGrossProceedsFromSaleOfResidentialLotsRangeAxis
= brn_AggregateGrossProceedsRangeTwoMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Kaupulehu Developments | Minimum | Aggregate gross proceeds in excess of $300,000,000          
Summary of investments          
Gross proceeds from sale of Increment I single-family lots on which payments to be received from KD I is based 300,000,000brn_AggregateGrossProceedsFromSaleOfIncrementISingleFamilyLotsForCalculatingPaymentsEntitledToBeReceived
/ brn_AggregateGrossProceedsFromSaleOfResidentialLotsRangeAxis
= brn_AggregateGrossProceedsRangeThreeMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Kaupulehu Developments | Maximum | Aggregate gross proceeds up to $100,000,000          
Summary of investments          
Gross proceeds from sale of Increment I single-family lots on which payments to be received from KD I is based 100,000,000brn_AggregateGrossProceedsFromSaleOfIncrementISingleFamilyLotsForCalculatingPaymentsEntitledToBeReceived
/ brn_AggregateGrossProceedsFromSaleOfResidentialLotsRangeAxis
= brn_AggregateGrossProceedsRangeOneMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Kaupulehu Developments | Maximum | Aggregate gross proceeds greater than $100,000,000 up to $300,000,000          
Summary of investments          
Gross proceeds from sale of Increment I single-family lots on which payments to be received from KD I is based 300,000,000brn_AggregateGrossProceedsFromSaleOfIncrementISingleFamilyLotsForCalculatingPaymentsEntitledToBeReceived
/ brn_AggregateGrossProceedsFromSaleOfResidentialLotsRangeAxis
= brn_AggregateGrossProceedsRangeTwoMember
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Kaupulehu Investors, LLC          
Summary of investments          
Ownership interest in subsidiaries (as a percent) 80.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember		        
Kaupulehu Investors, LLC | Haulalai Resort and Kona Village Resort          
Summary of investments          
Total investments         0us-gaap_LongTermInvestments
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= brn_HaulalaiResortAndKonaVillageResortMember
Ownership interest in subsidiaries (as a percent)         80.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= brn_HaulalaiResortAndKonaVillageResortMember
Cash proceeds received         3,297,000us-gaap_ProceedsFromSaleOfOtherInvestments
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= brn_HaulalaiResortAndKonaVillageResortMember
Gain on sale of investments         3,399,000us-gaap_GainOnSaleOfInvestments
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= brn_HaulalaiResortAndKonaVillageResortMember
Gain on sale of investments relating to Non-Controlling Interest         679,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= brn_HaulalaiResortAndKonaVillageResortMember
Capital and operating cash call investments         3,193,000us-gaap_PaymentsForProceedsFromInvestments
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= brn_HaulalaiResortAndKonaVillageResortMember
Kaupulehu Investors, LLC | Haulalai Resort          
Summary of investments          
Passive minority interests in various joint ventures (as a percent)         1.50%brn_CostMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= brn_HaulalaiResortMember
Kaupulehu Investors, LLC | Kona Village Resort          
Summary of investments          
Passive minority interests in various joint ventures (as a percent)         1.50%brn_CostMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= brn_KonaVillageResortMember
Kaupulehu Investors, LLC | Sale of an interest in a related utility          
Summary of investments          
Additional payment to be received         $ 102,000brn_AdditionalPaymentToBeReceivedFromSaleOfOtherInvestmentInterest
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= brn_SaleOfInterestInRelatedUtilityMember