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INFORMATION RELATING TO THE CONSOLIDATED STATEMENTS OF CASH FLOWS (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Increase (decrease) from changes in: |  |
Receivables | $ 542,000 us-gaap_IncreaseDecreaseInAccountsReceivable | $ 180,000 us-gaap_IncreaseDecreaseInAccountsReceivable
Other current assets | 1,629,000 us-gaap_IncreaseDecreaseInOtherCurrentAssets | (1,218,000)us-gaap_IncreaseDecreaseInOtherCurrentAssets
Accounts payable | (681,000)us-gaap_IncreaseDecreaseInAccountsPayable | 1,863,000 us-gaap_IncreaseDecreaseInAccountsPayable
Accrued compensation | (117,000)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities | 155,000 us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Other current liabilities | 976,000 us-gaap_IncreaseDecreaseInOtherCurrentLiabilities | (499,000)us-gaap_IncreaseDecreaseInOtherCurrentLiabilities
Increase from changes in current assets and liabilities | 2,349,000 us-gaap_IncreaseDecreaseInOperatingCapital | 481,000 us-gaap_IncreaseDecreaseInOperatingCapital
Supplemental disclosure of cash flow information: |  |
Interest | 646,000 us-gaap_InterestPaid | 564,000 us-gaap_InterestPaid
Income taxes paid, net of refunds | 765,000 us-gaap_IncomeTaxesPaidNet | 438,000 us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash investing and financing activities: |  |
Receivable for proceeds on sale of investments | 102,000 brn_AdditionalPaymentToBeReceivedFromSaleOfOtherInvestmentInterest |
Supplemental disclosures of cash flow information: |  |
Increase in capital expenditure accruals related to oil and natural gas asset retirement obligations | 2,542,000 us-gaap_IncreaseDecreaseInAssetRetirementObligations | 1,844,000 us-gaap_IncreaseDecreaseInAssetRetirementObligations
Oil and natural gas |  |
Supplemental disclosures of cash flow information: |  |
Increase (Decrease) in capital expenditure accruals related to oil and natural gas exploration and development | $ (1,195,000)brn_IncreaseDecreaseInOilAndNaturalGasExplorationAndDevelopmentAccruals / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember | $ 1,559,000 brn_IncreaseDecreaseInOilAndNaturalGasExplorationAndDevelopmentAccruals / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember

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- Definition The increase (decrease) during the reporting period in the capital expenditure accruals related to oil and natural gas exploration and development. + References No definition available. + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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