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INFORMATION RELATING TO THE CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Details) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Supplemental disclosure of cash flow information:
Interest	$ 86,000us-gaap_InterestPaid	$ 138,000us-gaap_InterestPaid
Income taxes paid (refunded)		(78,000)us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash investing and financing activities:
Note receivable for proceeds on sale of investment	907,000us-gaap_NotesIssued1
Payable to affiliate for investment in land development partnerships		1,000,000brn_InvestmentInLandDevelopmentPartnerships
Oil and natural gas
Supplemental disclosures of cash flow information:
Increase (Decrease) in capital expenditure accruals related to oil and natural gas exploration and development	106,000brn_IncreaseDecreaseInOilAndNaturalGasExplorationAndDevelopmentAccruals / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember	82,000brn_IncreaseDecreaseInOilAndNaturalGasExplorationAndDevelopmentAccruals / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember
Increase (Decrease) in capital expenditure accruals related to oil and natural gas asset retirement obligations	$ (76,000)us-gaap_IncreaseDecreaseInAssetRetirementObligations / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember	$ 57,000us-gaap_IncreaseDecreaseInAssetRetirementObligations / us-gaap_StatementBusinessSegmentsAxis = brn_OilAndNaturalGasMember

X

- Definition

The increase (decrease) during the reporting period in the capital expenditure accruals related to oil and natural gas exploration and development.

+ References

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- Definition

The amount of investments in land development partnerships in noncash transactions.

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Topic 230

-SubTopic 10

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- Definition

The fair value of notes issued in noncash investing and financing activities.

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