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NOTE RECEIVABLE (Details) (Investment in land, USD $)
In Thousands, unless otherwise specified
 1 Months Ended
Oct. 31, 2014
parcel
Investment in land
  
Note receivable  
Number of residential parcels sold 1brn_NumberOfResidentialParcelsSold
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember
Purchase or sales price $ 1,250us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember
Cash proceeds received $ 343brn_SignificantAcquisitionsAndDisposalsNetSaleProceeds
/ us-gaap_InvestmentTypeAxis
= brn_ResidentialParcelMember
Period after purchase closing date mortgage is due 270 days