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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 3 Months Ended 1 Months Ended
Mar. 31, 2015
venture
Oct. 31, 2014
parcel
Principles of Consolidation    
Number of 80%-owned joint ventures 2brn_NumberOfJointVentures  
Investment in land    
Note Receivable    
Number of residential parcels sold   1brn_NumberOfResidentialParcelsSold
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember
Allowance for note receivable 0us-gaap_AllowanceForNotesAndLoansReceivableCurrent
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember		  
Kaupulehu Developments    
Principles of Consolidation    
Ownership interest in subsidiaries (as a percent) 77.60%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember		  
KD Kona 2013 LLLP    
Principles of Consolidation    
Ownership interest in subsidiaries (as a percent) 75.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ dei_LegalEntityAxis
= brn_KDKona2013LLLPMember		  
Kaupulehu 2007, LLLP    
Principles of Consolidation    
Ownership interest in subsidiaries (as a percent) 80.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ dei_LegalEntityAxis
= brn_Kaupulehu2007LLLPMember		  
Kaupulehu Investors, LLC    
Principles of Consolidation    
Ownership interest in subsidiaries (as a percent) 80.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ dei_LegalEntityAxis
= brn_KaupulehuInvestorsLLCMember