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NOTE RECEIVABLE (Details) (Investment in land, USD $)	1 Months Ended
	Oct. 31, 2014 item
Investment in land
Note receivable
Number of residential parcels sold	1brn_NumberOfResidentialParcelsSold / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Purchase or sales price	$ 1,250,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Cash proceeds received (payments made)	$ 343,000brn_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