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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014 item
Principles of Consolidation |
Number of 80%-owned joint ventures | 2 brn_NumberOfJointVentures
Canadian revolving credit facility |
Foreign Currency Translation |
Foreign currency transaction gain realized on repayment of debt using Canadian dollars | 271,000 us-gaap_ForeignCurrencyTransactionGainLossRealized / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Repayment of the credit facility | 5,000,000 us-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 | 36,000 brn_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. + References No definition available. + Details
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- Definition The increase (decrease) in pension expense that would occur if the expected return on plan assets was decreased (increased) by 50 basis points. + References No definition available. + Details
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- Definition Represents the number of joint ventures owned by the entity. + References No definition available. + Details
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- Definition Represents the percentage of ownership interest in affiliated companies required to account investments under equity method investments. + References No definition available. + Details
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- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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