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SUPPLEMENTARY OIL AND NATURAL GAS INFORMATION (UNAUDITED) (Details) (USD $)
 12 Months Ended
Sep. 30, 2014
Boe
Sep. 30, 2013
Boe
SUPPLEMENTARY OIL AND NATURAL GAS INFORMATION (UNAUDITED)    
Proved undeveloped reserves 0us-gaap_ProvedUndevelopedReserveBOE1  
Changes in the estimates of net interests in total proved developed reserves of oil and natural gas liquids and natural gas    
Balance at the beginning of the period 2,689,000us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy 2,993,000us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy
Revisions of previous estimates 499,000us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy 242,000us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy
Extensions, discoveries and other additions 67,000us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy 31,000us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy
Less sales of reserves (383,000)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy  
Less production (516,000)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy (577,000)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy
Balance at the end of the period 2,356,000us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy 2,689,000us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy
Capitalized Costs Relating to Oil and Natural Gas Producing Activities    
Proved properties $ 209,201,000us-gaap_CapitalizedCostsProvedProperties $ 237,977,000us-gaap_CapitalizedCostsProvedProperties
Unproved properties 501,000us-gaap_CapitalizedCostsUnprovedProperties 1,266,000us-gaap_CapitalizedCostsUnprovedProperties
Total capitalized costs 209,702,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross 239,243,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross
Accumulated depletion and depreciation 191,478,000us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities 202,400,000us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities
Net capitalized costs 18,224,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet 36,843,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development    
Acquisition of unproved properties 42,000us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties 250,000us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
Exploration costs 884,000us-gaap_CostsIncurredExplorationCosts 1,485,000us-gaap_CostsIncurredExplorationCosts
Development costs 3,898,000us-gaap_CostsIncurredDevelopmentCosts 5,771,000us-gaap_CostsIncurredDevelopmentCosts
Total 4,824,000us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities 7,506,000us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities
Additions and revisions to asset retirement obligation included in development costs 2,542,000us-gaap_IncreaseDecreaseInAssetRetirementObligations 1,844,000us-gaap_IncreaseDecreaseInAssetRetirementObligations
Results of Operations for Oil and Natural Gas Producing Activities    
Net revenues 20,298,000us-gaap_OilAndGasSalesRevenue 21,376,000us-gaap_OilAndGasSalesRevenue
Production costs 8,914,000us-gaap_ResultsOfOperationsProductionOrLiftingCosts 9,992,000us-gaap_ResultsOfOperationsProductionOrLiftingCosts
Depletion 5,968,000us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions 8,034,000us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions
Reduction of carrying value of oil and natural gas properties   4,506,000us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties
Pre-tax results of operations 5,416,000us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes (1,156,000)us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes
Estimated income tax (expense) benefit (1,557,000)us-gaap_ResultsOfOperationsIncomeTaxExpense 335,000us-gaap_ResultsOfOperationsIncomeTaxExpense
Results of operations 3,859,000us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts (821,000)us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts
Standardized Measure of Discounted Future Net Cash Flows    
Future cash inflows 82,912,000us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows 99,867,000us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
Future production costs (40,156,000)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts (48,186,000)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
Future development costs (1,966,000)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts (1,472,000)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
Future income tax expenses (9,671,000)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense (7,800,000)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
Future net cash flows 31,119,000us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows 42,409,000us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
10% annual discount for timing of cash flows (6,972,000)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows (10,475,000)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
Standardized measure of discounted future net cash flows 24,147,000us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves 31,934,000us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
Changes in the Standardized Measure of Discounted Future Net Cash Flows    
Beginning of year 31,934,000us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves 35,290,000us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
Sales of oil and natural gas produced, net of production costs (11,384,000)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts (11,384,000)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts
Net changes in prices and production costs, net of royalties and wellhead taxes 8,670,000us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts 4,275,000us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts
Extensions and discoveries 2,199,000us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts 831,000us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts
Sales of reserves (8,408,000)us-gaap_DecreaseDueToSalesOfMineralsInPlace  
Revisions of previous quantity estimates 4,862,000us-gaap_RevisionsOfPreviousQuantityEstimates 857,000us-gaap_RevisionsOfPreviousQuantityEstimates
Net change in income taxes (4,148,000)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves (433,000)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves
Accretion of discount 2,931,000us-gaap_AccretionOfDiscount 3,376,000us-gaap_AccretionOfDiscount
Other - changes in the timing of future production and other (237,000)brn_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOtherDueToChangesInTimingOfFutureProductionAndOther 495,000brn_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOtherDueToChangesInTimingOfFutureProductionAndOther
Other - net change in Canadian dollar translation rate (2,272,000)brn_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOtherDueToChangeInForeignCurrencyTranslationRate (1,373,000)brn_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOtherDueToChangeInForeignCurrencyTranslationRate
Net Change (7,787,000)us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease (3,356,000)us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease
End of year $ 24,147,000us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves $ 31,934,000us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
OIL & NGL (Bbls)    
Changes in the estimates of net interests in total proved developed reserves of oil and natural gas liquids and natural gas    
Balance at the beginning of the period 923,000us-gaap_ProvedDevelopedAndUndevelopedReservesNet
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember		 1,078,000us-gaap_ProvedDevelopedAndUndevelopedReservesNet
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember
Revisions of previous estimates 189,000us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember		 46,000us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember
Extensions, discoveries and other additions 34,000us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember		 28,000us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember
Less sales of reserves (238,000)us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember		  
Less production (184,000)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember		 (229,000)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember
Balance at the end of the period 724,000us-gaap_ProvedDevelopedAndUndevelopedReservesNet
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember		 923,000us-gaap_ProvedDevelopedAndUndevelopedReservesNet
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= brn_OilAndNaturalGasLiquidsReservesMember
GAS (Mcf)    
Changes in the estimates of net interests in total proved developed reserves of oil and natural gas liquids and natural gas    
Balance at the beginning of the period 10,245,000us-gaap_ProvedDevelopedAndUndevelopedReservesNet
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember		 11,109,000us-gaap_ProvedDevelopedAndUndevelopedReservesNet
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember
Revisions of previous estimates 1,798,000us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember		 1,137,000us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember
Extensions, discoveries and other additions 189,000us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember		 17,000us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember
Less sales of reserves (840,000)us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember		  
Less production (1,927,000)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember		 (2,018,000)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember
Balance at the end of the period 9,465,000us-gaap_ProvedDevelopedAndUndevelopedReservesNet
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember		 10,245,000us-gaap_ProvedDevelopedAndUndevelopedReservesNet
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember