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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 3 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 item | Oct. 31, 2014 item
Principles of Consolidation |  |
Number of 80%-owned joint ventures | 2 brn_NumberOfJointVentures |
Investment in land |  |
Note Receivable |  |
Number of residential parcels sold |  | 1 brn_NumberOfResidentialParcelsSold / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Allowance for note receivable | 0 us-gaap_AllowanceForNotesAndLoansReceivableCurrent / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember |
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 A valuation allowance relating to a written agreement to receive money (at a specified future date(s) within one year from the reporting date (or the normal operating cycle, whichever is longer), consisting of principal as well as any accrued interest) for the portion that is 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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