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SEGMENT AND GEOGRAPHIC INFORMATION (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Revenues: |  |
Total before gain on sale of investments and interest income | $ 28,017,000 us-gaap_SalesRevenueNet | $ 24,563,000 us-gaap_SalesRevenueNet
Gain on sale of investments | 3,399,000 us-gaap_GainOnSaleOfInvestments |
Interest income | 29,000 us-gaap_InvestmentIncomeInterest | 45,000 us-gaap_InvestmentIncomeInterest
Total revenues | 31,445,000 us-gaap_Revenues | 24,608,000 us-gaap_Revenues
Depletion, depreciation, and amortization: |  |
Total depletion, depreciation, and amortization | 6,391,000 us-gaap_DepreciationDepletionAndAmortization | 8,542,000 us-gaap_DepreciationDepletionAndAmortization
Reduction of carrying value of assets: |  |
Reduction of carrying value of assets |  | 4,506,000 us-gaap_AssetImpairmentCharges
Operating profit (loss) (before general and administrative expenses): |  |
Total operating profit (loss) | 7,686,000 us-gaap_OperatingIncomeLoss | (716,000)us-gaap_OperatingIncomeLoss
Equity in loss of affiliates: |  |
Equity in loss of affiliates | (482,000)us-gaap_IncomeLossFromEquityMethodInvestments |
General and administrative expenses | (8,026,000)us-gaap_GeneralAndAdministrativeExpense | (8,911,000)us-gaap_GeneralAndAdministrativeExpense
Interest expense | (664,000)us-gaap_InterestExpense | (587,000)us-gaap_InterestExpense
Gain on sale of investments | 3,399,000 us-gaap_GainOnSaleOfInvestments |
Interest income | 29,000 us-gaap_InvestmentIncomeInterest | 45,000 us-gaap_InvestmentIncomeInterest
Income (loss) before income taxes | 1,942,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (10,169,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Capital Expenditures: |  |
Capital Expenditure | 4,923,000 us-gaap_PaymentsToAcquireProductiveAssets | 7,525,000 us-gaap_PaymentsToAcquireProductiveAssets
Assets By Segment: |  |
Total assets | 54,770,000 us-gaap_Assets | 62,714,000 us-gaap_Assets
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 gain on sale of investments and interest income | 20,298,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember | 21,376,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember
Depletion, depreciation, and amortization: |  |
Total depletion, depreciation, and amortization | 5,968,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember | 8,034,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember
Reduction of carrying value of assets: |  |
Reduction of carrying value of assets |  | 4,506,000 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember
Operating profit (loss) (before general and administrative expenses): |  |
Total operating profit (loss) | 5,416,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember | (1,156,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember
Capital Expenditures: |  |
Capital Expenditure | 4,824,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember | 7,506,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember
Assets By Segment: |  |
Total assets | 20,951,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember | 40,559,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember
Land investment |  |
Revenues: |  |
Total before gain on sale of investments and interest income | 636,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember | 282,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember
Operating profit (loss) (before general and administrative expenses): |  |
Total operating profit (loss) | 636,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember | 282,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember
Equity in loss of affiliates: |  |
Equity in loss of affiliates | (482,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember |
Assets By Segment: |  |
Total assets | 7,039,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember | 2,381,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = brn_LandInvestmentMember
Contract drilling |  |
Revenues: |  |
Total before gain on sale of investments and interest income | 6,287,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember | 2,338,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember
Depletion, depreciation, and amortization: |  |
Total depletion, depreciation, and amortization | 309,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember | 394,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember
Operating profit (loss) (before general and administrative expenses): |  |
Total operating profit (loss) | 952,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember | (295,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember
Capital Expenditures: |  |
Capital Expenditure | 48,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember | 17,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember
Assets By Segment: |  |
Total assets | 1,849,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember | 2,905,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = brn_ContractDrillingMember
Residential real estate |  |
Assets By Segment: |  |
Total assets | 5,448,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 5,448,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember
Other |  |
Revenues: |  |
Total before gain on sale of investments and interest income | 796,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 567,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Depletion, depreciation, and amortization: |  |
Total depletion, depreciation, and amortization | 114,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 114,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Operating profit (loss) (before general and administrative expenses): |  |
Total operating profit (loss) | 682,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 453,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Capital Expenditures: |  |
Capital Expenditure | 51,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 2,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Cash and cash equivalents |  |
Assets By Segment: |  |
Total assets | 16,104,000 us-gaap_Assets / us-gaap_BalanceSheetLocationAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 7,828,000 us-gaap_Assets / us-gaap_BalanceSheetLocationAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Corporate and other |  |
Assets By Segment: |  |
Total assets | $ 3,379,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | $ 3,593,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember

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