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INCENTIVE COMPENSATION PLAN (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
INCENTIVE COMPENSATION PLAN
Costs recognized pursuant to plan	$ 0brn_IncentiveCompensationPlanCompensationExpense	$ 30,000brn_IncentiveCompensationPlanCompensationExpense
Amounts accrued under the plan	$ 68,000brn_IncentiveCompensationPlanRecordedLiability	$ 404,000brn_IncentiveCompensationPlanRecordedLiability

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