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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Sep. 30, 2014 item
Principles of Consolidation
Number of 80%-owned joint ventures	2brn_NumberOfJointVentures
Canadian revolving credit facility
Foreign Currency Translation
Foreign currency transaction gain realized on repayment of debt using Canadian dollars	271,000us-gaap_ForeignCurrencyTransactionGainLossRealized / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Repayment of the credit facility	5,000,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Minimum
Equity Method Investments
Ownership interest in affiliated companies required to account investments under equity method investments (as a percent)	3.00%brn_OwnershipInterestInAffiliatedCompaniesRequiredToAccountInvestmentsUnderEquityMethodInvestments / us-gaap_RangeAxis = us-gaap_MinimumMember
Retirement Plans
Decrease (increase) in the expected return on plan assets assumption	0.50%brn_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfExpectedLongTermReturnOnAssetsIncreaseDecrease / us-gaap_RangeAxis = us-gaap_MinimumMember
Increase (decrease) pension expense	36,000brn_DefinedBenefitPlanIncreaseDecreaseFromExpectedReturnOnPlanAssets / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Equity Method Investments
Ownership interest in affiliated companies required to account investments under equity method investments (as a percent)	5.00%brn_OwnershipInterestInAffiliatedCompaniesRequiredToAccountInvestmentsUnderEquityMethodInvestments / us-gaap_RangeAxis = us-gaap_MaximumMember
Retirement Plans
Decrease (increase) in the expected return on plan assets assumption	(0.50%)brn_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfExpectedLongTermReturnOnAssetsIncreaseDecrease / us-gaap_RangeAxis = us-gaap_MaximumMember
Increase (decrease) pension expense	(36,000)brn_DefinedBenefitPlanIncreaseDecreaseFromExpectedReturnOnPlanAssets / us-gaap_RangeAxis = us-gaap_MaximumMember
Kaupulehu Developments
Principles of Consolidation
Ownership interest in subsidiaries (as a percent)	77.60%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember
KD Kona 2013 LLLP
Principles of Consolidation
Ownership interest in subsidiaries (as a percent)	75.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = brn_KDKona2013LLLPMember
Kaupulehu 2007, LLLP
Principles of Consolidation
Ownership interest in subsidiaries (as a percent)	80.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = brn_Kaupulehu2007LLLPMember
Kaupulehu Investors, LLC
Principles of Consolidation
Ownership interest in subsidiaries (as a percent)	80.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = brn_KaupulehuInvestorsLLCMember

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- Definition

An assumption as to an increase or decrease on the rate of return on plan assets reflecting the earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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The increase (decrease) in pension expense that would occur if the expected return on plan assets was decreased (increased) by 50 basis points.

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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