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SUPPLEMENTARY OIL AND NATURAL GAS INFORMATION (UNAUDITED) (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014 Boe | Sep. 30, 2013 Boe
SUPPLEMENTARY OIL AND NATURAL GAS INFORMATION (UNAUDITED) |  |
Proved undeveloped reserves | 0 us-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 | 2,689,000 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 2,993,000 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy
Revisions of previous estimates | 499,000 us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy | 242,000 us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy
Extensions, discoveries and other additions | 67,000 us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy | 31,000 us-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 | 2,356,000 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 2,689,000 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy
Capitalized Costs Relating to Oil and Natural Gas Producing Activities |  |
Proved properties | $ 209,201,000 us-gaap_CapitalizedCostsProvedProperties | $ 237,977,000 us-gaap_CapitalizedCostsProvedProperties
Unproved properties | 501,000 us-gaap_CapitalizedCostsUnprovedProperties | 1,266,000 us-gaap_CapitalizedCostsUnprovedProperties
Total capitalized costs | 209,702,000 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross | 239,243,000 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross
Accumulated depletion and depreciation | 191,478,000 us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities | 202,400,000 us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities
Net capitalized costs | 18,224,000 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet | 36,843,000 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development |  |
Acquisition of unproved properties | 42,000 us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties | 250,000 us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
Exploration costs | 884,000 us-gaap_CostsIncurredExplorationCosts | 1,485,000 us-gaap_CostsIncurredExplorationCosts
Development costs | 3,898,000 us-gaap_CostsIncurredDevelopmentCosts | 5,771,000 us-gaap_CostsIncurredDevelopmentCosts
Total | 4,824,000 us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities | 7,506,000 us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities
Additions and revisions to asset retirement obligation included in development costs | 2,542,000 us-gaap_IncreaseDecreaseInAssetRetirementObligations | 1,844,000 us-gaap_IncreaseDecreaseInAssetRetirementObligations
Results of Operations for Oil and Natural Gas Producing Activities |  |
Net revenues | 20,298,000 us-gaap_OilAndGasSalesRevenue | 21,376,000 us-gaap_OilAndGasSalesRevenue
Production costs | 8,914,000 us-gaap_ResultsOfOperationsProductionOrLiftingCosts | 9,992,000 us-gaap_ResultsOfOperationsProductionOrLiftingCosts
Depletion | 5,968,000 us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions | 8,034,000 us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions
Reduction of carrying value of oil and natural gas properties |  | 4,506,000 us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties
Pre-tax results of operations | 5,416,000 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes | (1,156,000)us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes
Estimated income tax (expense) benefit | (1,557,000)us-gaap_ResultsOfOperationsIncomeTaxExpense | 335,000 us-gaap_ResultsOfOperationsIncomeTaxExpense
Results of operations | 3,859,000 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts | (821,000)us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts
Standardized Measure of Discounted Future Net Cash Flows |  |
Future cash inflows | 82,912,000 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows | 99,867,000 us-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 | 31,119,000 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows | 42,409,000 us-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 | 24,147,000 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | 31,934,000 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
Changes in the Standardized Measure of Discounted Future Net Cash Flows |  |
Beginning of year | 31,934,000 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | 35,290,000 us-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 | 8,670,000 us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts | 4,275,000 us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts
Extensions and discoveries | 2,199,000 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts | 831,000 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts
Sales of reserves | (8,408,000)us-gaap_DecreaseDueToSalesOfMineralsInPlace |
Revisions of previous quantity estimates | 4,862,000 us-gaap_RevisionsOfPreviousQuantityEstimates | 857,000 us-gaap_RevisionsOfPreviousQuantityEstimates
Net change in income taxes | (4,148,000)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves | (433,000)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves
Accretion of discount | 2,931,000 us-gaap_AccretionOfDiscount | 3,376,000 us-gaap_AccretionOfDiscount
Other - changes in the timing of future production and other | (237,000)brn_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOtherDueToChangesInTimingOfFutureProductionAndOther | 495,000 brn_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 | $ 24,147,000 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | $ 31,934,000 us-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 | 923,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = brn_OilAndNaturalGasLiquidsReservesMember | 1,078,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = brn_OilAndNaturalGasLiquidsReservesMember
Revisions of previous estimates | 189,000 us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = brn_OilAndNaturalGasLiquidsReservesMember | 46,000 us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = brn_OilAndNaturalGasLiquidsReservesMember
Extensions, discoveries and other additions | 34,000 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = brn_OilAndNaturalGasLiquidsReservesMember | 28,000 us-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 | 724,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = brn_OilAndNaturalGasLiquidsReservesMember | 923,000 us-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 | 10,245,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember | 11,109,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember
Revisions of previous estimates | 1,798,000 us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember | 1,137,000 us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember
Extensions, discoveries and other additions | 189,000 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember | 17,000 us-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 | 9,465,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember | 10,245,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember

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- Definition Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Properties -URI http://asc.fasb.org/extlink&oid=21914647 + Details
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