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INVESTMENTS - LAND DEVELOPMENT PARTNERSHIPS (Details) (Investment in land development partnerships, USD $)
In Thousands, unless otherwise specified
3 Months Ended 4 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2014
Mar. 31, 2015
Investment in land development partnerships
       
Investment Holdings [Line Items]        
Revenue $ 6,081us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
$ 1,353us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
$ 1,622us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
$ 10,707us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
Gross profit 2,982us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
545us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
653us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
4,409us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
Net earnings (loss) $ 2,143us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
$ (428)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
$ (809)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember
$ 2,563us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_InvestmentTypeAxis
= brn_LandDevelopmentPartnershipsMember