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INCENTIVE COMPENSATION PLAN (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
INCENTIVE COMPENSATION PLAN |  |
Costs recognized pursuant to plan | $ 0 | $ 41,000
Amounts accrued under the plan | $ 394,000 | $ 681,000

X
- Definition The compensation expense recognized during the period under an incentive compensation arrangement. + References No definition available. + Details
Name: | brn_IncentiveCompensationPlanCompensationExpense
Namespace Prefix: | brn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | brn_IncentiveCompensationPlanDisclosureAbstract
Namespace Prefix: | brn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying amount of the liability as of the balance sheet date under an incentive compensation arrangement. + References No definition available. + Details
Name: | brn_IncentiveCompensationPlanRecordedLiability
Namespace Prefix: | brn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant