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NOTE RECEIVABLE (Details) (Investment in land, USD $) | 1 Months Ended
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Oct. 31, 2014 item
Investment in land |
Note receivable |
Number of residential parcels sold | 1 brn_NumberOfResidentialParcelsSold / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Purchase or sales price | $ 1,250,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Cash proceeds received (payments made) | $ 343,000 brn_SignificantAcquisitionsAndDisposalsNetSaleProceeds / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Period after purchase closing date mortgage is due | 270 days

X
- Definition Represents the number of residential parcels sold to date. + References No definition available. + Details
Name: | brn_NumberOfResidentialParcelsSold
Namespace Prefix: | brn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period after purchase closing date the mortgage is due. + References No definition available. + Details
Name: | brn_SignificantAcquisitionsAndDisposalsMortgagePeriodDueFromClosingDate
Namespace Prefix: | brn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the sale proceeds received by the entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | brn_SignificantAcquisitionsAndDisposalsNetSaleProceeds
Namespace Prefix: | brn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant