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RELATED PARTY TRANSACTIONS (Details) (Kaupulehu Developments, USD $)	12 Months Ended		10 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 item
Related party transactions
Percentage of sales payment received	$ 740,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross	$ 300,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross
KD Kaupulehu, LLLP | Investment in land development partnerships
Related party transactions
Ownership interest acquired (as a percent)	19.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = brn_KDKaupulehuLLLPMember		19.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = brn_KDKaupulehuLLLPMember
Percentage of sales payment received			$ 600,000brn_ProceedsFromSaleOfInterestInLeaseholdLandGross / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = brn_KDKaupulehuLLLPMember
Number of lots sold in Increment I			2brn_NumberOfSingleFamilyLotsSold / us-gaap_InvestmentTypeAxis = brn_LandDevelopmentPartnershipsMember / dei_LegalEntityAxis = brn_KaupulehuDevelopmentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = brn_KDKaupulehuLLLPMember

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- Definition

Represents the number of single-family lots sold to date.

+ References

No definition available.

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- Definition

The gross cash inflow from the sale of interest in leasehold land.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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