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ACCOUNTS RECEIVABLE AND CONTRACT COSTS (Details) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
ACCOUNTS RECEIVABLE AND CONTRACT COSTS    
Allowances for doubtful accounts $ 34,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 43,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Contract retainage balance included in accounts receivable 202,000us-gaap_ContractReceivableRetainage 52,000us-gaap_ContractReceivableRetainage
Expected collection period of retainage balance 1 year  
Expected collection period of retainage balance after the related contracts have received final acceptance and approval 45 days  
Costs and estimated earnings (loss) on uncompleted contracts    
Costs incurred on uncompleted contracts 6,049,000brn_CostsIncurredOnUncompletedContracts 2,457,000brn_CostsIncurredOnUncompletedContracts
Estimated earnings (loss) 472,000brn_EstimatedEarningsOnUncompletedContracts (251,000)brn_EstimatedEarningsOnUncompletedContracts
Costs and estimated earnings (loss) on uncompleted contracts 6,521,000brn_CostsAndEstimatedEarningsOnUncompletedContracts 2,206,000brn_CostsAndEstimatedEarningsOnUncompletedContracts
Less billings to date 7,094,000brn_BillingsToDateOnUncompletedContracts 1,629,000brn_BillingsToDateOnUncompletedContracts
Net costs and estimated earnings (loss) in excess of (less than) billings (573,000)brn_NetCostsAndEstimatedEarningsLossInExcessOfLessThanBillings 577,000brn_NetCostsAndEstimatedEarningsLossInExcessOfLessThanBillings
Costs and estimated earnings (loss) on uncompleted contracts included in the consolidated balance sheets    
Costs and estimated earnings in excess of billings on uncompleted contracts (included in other current assets) 21,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear 1,011,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Billings in excess of costs and estimated earnings on uncompleted contracts (included in other current liabilities) (594,000)us-gaap_BillingsInExcessOfCostCurrent (434,000)us-gaap_BillingsInExcessOfCostCurrent
Net costs and estimated earnings (loss) in excess of (less than) billings $ (573,000)brn_NetCostsAndEstimatedEarningsLossInExcessOfLessThanBillings $ 577,000brn_NetCostsAndEstimatedEarningsLossInExcessOfLessThanBillings