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INVESTMENTS - SUMMARY OF INVESTMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Investment Holdings [Line Items]    
Investments $ 6,356us-gaap_LongTermInvestments $ 5,900us-gaap_LongTermInvestments
Residential Parcel    
Investment Holdings [Line Items]    
Investments 1,192us-gaap_LongTermInvestments
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember		 1,192us-gaap_LongTermInvestments
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember
Investment in land development partnerships    
Investment Holdings [Line Items]    
Investments 5,114us-gaap_LongTermInvestments
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember		 4,658us-gaap_LongTermInvestments
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
Investment in leasehold land interest - Lot 4C    
Investment Holdings [Line Items]    
Investments $ 50us-gaap_LongTermInvestments
/ us-gaap_InvestmentTypeAxis
= brn_LandInterestMember		 $ 50us-gaap_LongTermInvestments
/ us-gaap_InvestmentTypeAxis
= brn_LandInterestMember