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

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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.

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