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INCOME TAXES (Details) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Components of income (loss) before income taxes, after adjusting the income (loss) for non-controlling interests    
United States $ (629,000)brn_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndAfterAdjustingIncomeLossForNoncontrollingInterestsDomestic $ (4,832,000)brn_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndAfterAdjustingIncomeLossForNoncontrollingInterestsDomestic
Canada 1,905,000brn_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndAfterAdjustingIncomeLossForNoncontrollingInterestsForeign (5,228,000)brn_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndAfterAdjustingIncomeLossForNoncontrollingInterestsForeign
Total 1,276,000brn_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndAfterAdjustingIncomeLossForNoncontrollingInterests (10,060,000)brn_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndAfterAdjustingIncomeLossForNoncontrollingInterests
Current (benefit) provision :    
US Federal - Before operating loss carryforwards 886,000brn_FederalTaxBeforeOperatingLossCarryforwards  
US Federal - Benefit of operating loss carryforwards (886,000)us-gaap_CurrentFederalTaxExpenseBenefit  
United States - State (1,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit (82,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total United States (1,000)brn_CurrentDomesticTaxExpenseBenefit (82,000)brn_CurrentDomesticTaxExpenseBenefit
Canadian 1,312,000us-gaap_CurrentForeignTaxExpenseBenefit 45,000us-gaap_CurrentForeignTaxExpenseBenefit
Total current 1,311,000us-gaap_CurrentIncomeTaxExpenseBenefit (37,000)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred benefit:    
United States   82,000brn_DeferredFederalStateAndLocalIncomeTaxExpenseBenefit
Canadian (707,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (1,542,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred (707,000)us-gaap_DeferredIncomeTaxExpenseBenefit (1,460,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Total 604,000us-gaap_IncomeTaxExpenseBenefit (1,497,000)us-gaap_IncomeTaxExpenseBenefit
Reconciliation between the reported income tax provision (benefit) and the amount computed by multiplying the loss attributable to the entity by the U.S. federal tax rate    
U.S. federal tax rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Tax provision (benefit) computed by applying statutory rate 447,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (3,521,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase in the valuation allowance 615,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 2,978,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Additional effect of the foreign tax provision on the total tax provision (467,000)brn_IncomeTaxReconciliationChangeInForeignTaxNetCreditables (1,018,000)brn_IncomeTaxReconciliationChangeInForeignTaxNetCreditables
Expiration of foreign tax credit carryforward   249,000us-gaap_IncomeTaxReconciliationTaxCreditsForeign
State income tax benefit (31,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (365,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other 40,000us-gaap_IncomeTaxReconciliationOtherAdjustments 180,000us-gaap_IncomeTaxReconciliationOtherAdjustments
Total 604,000us-gaap_IncomeTaxExpenseBenefit (1,497,000)us-gaap_IncomeTaxExpenseBenefit
Deferred income tax assets:    
U.S. tax effect of deferred Canadian taxes 248,000brn_DeferredTaxAssetsTaxEffect 526,000brn_DeferredTaxAssetsTaxEffect
Foreign tax credit carryover 3,023,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 1,715,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Alternative minimum tax credit carryover 460,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 460,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
U.S. federal net operating loss carryover 4,017,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 4,903,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax basis of investment in land and residential real estate in excess of book basis 1,842,000us-gaap_DeferredTaxAssetsInvestments 1,756,000us-gaap_DeferredTaxAssetsInvestments
Property and equipment accumulated tax depreciation and depletion in excess of book under U.S. tax law 4,069,000brn_DeferredTaxAssetsPropertyPlantAndEquipmentDomestic 5,196,000brn_DeferredTaxAssetsPropertyPlantAndEquipmentDomestic
Liabilities accrued for books but not for tax under U.S. tax law 5,112,000brn_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesDomestic 4,338,000brn_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesDomestic
Liabilities accrued for books but not for tax under Canadian tax law 2,731,000brn_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesForeign 2,409,000brn_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesForeign
Other 2,098,000us-gaap_DeferredTaxAssetsOther 2,085,000us-gaap_DeferredTaxAssetsOther
Total gross deferred tax assets 23,600,000us-gaap_DeferredTaxAssetsGross 23,388,000us-gaap_DeferredTaxAssetsGross
Less valuation allowance (20,869,000)us-gaap_DeferredTaxAssetsValuationAllowance (20,979,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax assets 2,731,000us-gaap_DeferredTaxAssetsNet 2,409,000us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:    
Property and equipment accumulated tax depreciation and depletion in excess of book under Canadian tax law (3,460,000)brn_DeferredTaxLiabilitiesPropertyPlantAndEquipmentForeign (3,957,000)brn_DeferredTaxLiabilitiesPropertyPlantAndEquipmentForeign
Other (94,000)us-gaap_DeferredTaxLiabilitiesOther (95,000)us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities (3,554,000)us-gaap_DeferredIncomeTaxLiabilities (4,052,000)us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax liability (823,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (1,643,000)us-gaap_DeferredTaxAssetsLiabilitiesNet
Net deferred income tax liability included in Consolidated Balance Sheets:    
Current deferred income tax asset (included in other current assets) 378,000us-gaap_DeferredTaxAssetsNetCurrent 247,000us-gaap_DeferredTaxAssetsNetCurrent
Deferred income tax liability (1,201,000)us-gaap_DeferredTaxLiabilitiesNoncurrent (1,890,000)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred income tax liability (823,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (1,643,000)us-gaap_DeferredTaxAssetsLiabilitiesNet
Valuation allowance, other disclosures    
Decrease in valuation allowance (110,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Increase in the valuation allowance recognized as income tax expense 615,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 2,978,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Decrease in valuation allowance credited to accumulated other comprehensive loss 725,000brn_ValuationAllowanceDeferredTaxAssetChangeInAmountRecognizedInAccumulatedOtherComprehensiveIncomeLoss  
Alternative minimum tax credit    
Tax credit carryforward    
Tax credit carryovers 460,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_InvestmentCreditMember		  
Foreign    
Tax credit carryforward    
Tax credit carryovers 3,023,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		  
Federal    
Operating loss carryforwards    
Operating loss carryovers $ 11,816,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember