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SEGMENT INFORMATION (Details) (USD $) | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Revenues: |  |
Total before interest income | $ 6,015,000 us-gaap_SalesRevenueNet | $ 7,197,000 us-gaap_SalesRevenueNet
Interest income | 17,000 us-gaap_InvestmentIncomeInterest | 4,000 us-gaap_InvestmentIncomeInterest
Total revenues | 6,032,000 us-gaap_Revenues | 7,201,000 us-gaap_Revenues
Depletion, depreciation, and amortization: |  |
Total depletion, depreciation, and amortization | 979,000 us-gaap_DepreciationDepletionAndAmortization | 2,164,000 us-gaap_DepreciationDepletionAndAmortization
Operating profit (before general and administrative expenses): |  |
Total operating profit | 1,888,000 us-gaap_OperatingIncomeLoss | 1,100,000 us-gaap_OperatingIncomeLoss
Equity in loss of affiliates: |  |
Equity in income (loss) of affiliates | 88,000 us-gaap_IncomeLossFromEquityMethodInvestments | (147,000)us-gaap_IncomeLossFromEquityMethodInvestments
General and administrative expenses | (2,275,000)us-gaap_GeneralAndAdministrativeExpense | (1,856,000)us-gaap_GeneralAndAdministrativeExpense
Interest expense | (90,000)us-gaap_InterestExpense | (163,000)us-gaap_InterestExpense
Interest income | 17,000 us-gaap_InvestmentIncomeInterest | 4,000 us-gaap_InvestmentIncomeInterest
Loss before income taxes | (372,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (1,062,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Intersegment elimination |  |
Revenues: |  |
Total revenues | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Oil and natural gas |  |
Revenues: |  |
Total before interest income | 2,972,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember | 5,327,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember
Depletion, depreciation, and amortization: |  |
Total depletion, depreciation, and amortization | 883,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember | 2,059,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember
Operating profit (before general and administrative expenses): |  |
Total operating profit | 466,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember | 647,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember
Land investment |  |
Revenues: |  |
Total before interest income | 1,032,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember | 120,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember
Operating profit (before general and administrative expenses): |  |
Total operating profit | 1,032,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember | 120,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember
Equity in loss of affiliates: |  |
Equity in income (loss) of affiliates | 88,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember | (147,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember
Contract drilling |  |
Revenues: |  |
Total before interest income | 1,933,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember | 1,609,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember
Depletion, depreciation, and amortization: |  |
Total depletion, depreciation, and amortization | 71,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember | 78,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember
Operating profit (before general and administrative expenses): |  |
Total operating profit | 337,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember | 219,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember
Other |  |
Revenues: |  |
Total before interest income | 78,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 141,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Depletion, depreciation, and amortization: |  |
Total depletion, depreciation, and amortization | 25,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 27,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Operating profit (before general and administrative expenses): |  |
Total operating profit | $ 53,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ 114,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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