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REAL ESTATE HELD FOR SALE (Details) (Kaupulehu 2007)	Dec. 31, 2012 item
Kaupulehu 2007
Real estate held for sale
Number of luxury residences owned	1

X

- Definition

Represents the number of residential units owned.

+ References

No definition available.

+ Details

Name:	brn_NumberOfResidentialUnitsOwned
Namespace Prefix:	brn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration