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ACCOUNTS RECEIVABLE AND CONTRACT COSTS (Details) (USD $) | 12 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013
ACCOUNTS RECEIVABLE AND CONTRACT COSTS |  |
Allowances for doubtful accounts | $ 34,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 43,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Contract retainage balance included in accounts receivable | 202,000 us-gaap_ContractReceivableRetainage | 52,000 us-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 | 6,049,000 brn_CostsIncurredOnUncompletedContracts | 2,457,000 brn_CostsIncurredOnUncompletedContracts
Estimated earnings (loss) | 472,000 brn_EstimatedEarningsOnUncompletedContracts | (251,000)brn_EstimatedEarningsOnUncompletedContracts
Costs and estimated earnings (loss) on uncompleted contracts | 6,521,000 brn_CostsAndEstimatedEarningsOnUncompletedContracts | 2,206,000 brn_CostsAndEstimatedEarningsOnUncompletedContracts
Less billings to date | 7,094,000 brn_BillingsToDateOnUncompletedContracts | 1,629,000 brn_BillingsToDateOnUncompletedContracts
Net costs and estimated earnings (loss) in excess of (less than) billings | (573,000)brn_NetCostsAndEstimatedEarningsLossInExcessOfLessThanBillings | 577,000 brn_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) | 21,000 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear | 1,011,000 us-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 | $ 577,000 brn_NetCostsAndEstimatedEarningsLossInExcessOfLessThanBillings

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- Definition Represents the expected collection period of amount billed to customers under contracts or programs that have been withheld because of retainage provisions in a contract. + References No definition available. + Details
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- Definition Represents the expected collection period of amount billed to customers under contracts or programs that have been withheld because of retainage provisions in a contract, after the related contracts have received final acceptance and approval. + References No definition available. + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57788-111642 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57807-111642 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57795-111642 + Details
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- Definition Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49370-109356 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c(1) -Article 5 + Details
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