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INVESTMENTS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Nov. 27, 2013
partnership
Oct. 31, 2014
Investment Holdings [Line Items]            
Land investment $ 368us-gaap_IncomeLossFromEquityMethodInvestments $ (116)us-gaap_IncomeLossFromEquityMethodInvestments $ 456us-gaap_IncomeLossFromEquityMethodInvestments $ (263)us-gaap_IncomeLossFromEquityMethodInvestments    
Investment in land            
Investment Holdings [Line Items]            
Number of residential parcels owned 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember
  1us-gaap_NumberOfRealEstateProperties
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember
     
Purchase or sales price           1,250us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember
Investment in land development partnerships            
Investment Holdings [Line Items]            
Number of limited liability limited partnerships formed         2brn_NumberOfLimitedLiabilityLimitedPartnershipsFormed
/ 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 315us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
  315us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
     
Bonds issued by the surety 4,830us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
  4,830us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
     
Maximum loss exposure 9,944us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
  9,944us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
     
Investment in land development partnerships | KD Kukio Resorts, LLLP, KD Maniniowali, LLLP, and KD Kaupulehu, LLLP            
Investment Holdings [Line Items]            
Ownership interest acquired, aggregate cost         5,140us-gaap_EquityMethodInvestmentAggregateCost
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= brn_IndirectlyAcquiredInterestMember
 
Investment in land development partnerships | KD Kukio Resorts, LLLP            
Investment Holdings [Line Items]            
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            
Investment Holdings [Line Items]            
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            
Investment Holdings [Line Items]            
Ownership interest acquired (as a percent)         19.60%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= brn_KDKaupulehuLLLPMember