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LONG-TERM DEBT (Details)			1 Months Ended	3 Months Ended						1 Months Ended
	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Oct. 31, 2014 Investment in land item	Dec. 31, 2014 Canadian revolving credit facility USD ($)	Dec. 31, 2014 Canadian revolving credit facility CAD	Sep. 30, 2014 Canadian revolving credit facility USD ($)	Apr. 30, 2015 Canadian revolving credit facility Subsequent event CAD	Dec. 31, 2014 Real estate loan USD ($)	Sep. 30, 2014 Real estate loan USD ($)	Oct. 31, 2014 Real estate loan Investment in land USD ($)
Long-term debt
Long-term debt	$ 10,697,000us-gaap_LongTermDebt	$ 11,099,000us-gaap_LongTermDebt		$ 7,000,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember		$ 7,000,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember		$ 3,697,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember	$ 4,099,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Less: current portion	(5,697,000)us-gaap_LongTermDebtCurrent	(4,449,000)us-gaap_LongTermDebtCurrent
Total long-term debt	5,000,000us-gaap_LongTermDebtNoncurrent	6,650,000us-gaap_LongTermDebtNoncurrent
Long-term debt, additional disclosures
Maximum borrowing capacity				10,172,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember	11,800,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember		6,500,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Interest rate on the facility (as a percent)				2.66%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember	2.66%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Renewal period with no required debt repayments				1 year	1 year
Period of term loan if credit facility term date is not extended				2 years	2 years
Interest rate (as a percent)								3.41%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Number of Residential Parcels Sold			1brn_NumberOfResidentialParcelsSold / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember
Debt repaid as a result of the sale of one of the residential parcels										266,000us-gaap_RepaymentsOfDebt / us-gaap_InvestmentTypeAxis = brn_ResidentialParcelMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Repayment schedule if the facility is converted to a two-year term loan
Percentage of outstanding loan balance to be repaid in first year of the term period				20.00%brn_LineOfCreditFacilityConversionRepaymentPercentageYearOne / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember	20.00%brn_LineOfCreditFacilityConversionRepaymentPercentageYearOne / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Percentage of outstanding loan balance to be repaid per quarter in first year of the term period				5.00%brn_LineOfCreditFacilityConversionRepaymentPercentagePerQuarterYearOne / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember	5.00%brn_LineOfCreditFacilityConversionRepaymentPercentagePerQuarterYearOne / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Percentage of outstanding loan balance to be repaid in second year of the term period				80.00%brn_LineOfCreditFacilityConversionRepaymentPercentageYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember	80.00%brn_LineOfCreditFacilityConversionRepaymentPercentageYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Percentage of outstanding loan balance to be repaid per quarter for first three quarters in second year of the term period				5.00%brn_LineOfCreditFacilityConversionRepaymentPercentagePerQuarterForFirstThreeQuartersOfYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember	5.00%brn_LineOfCreditFacilityConversionRepaymentPercentagePerQuarterForFirstThreeQuartersOfYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Percentage of outstanding loan balance to be repaid in the final quarter of the second year of the term period				65.00%brn_LineOfCreditFacilityConversionRepaymentPercentageInFinalQuarterOfYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember	65.00%brn_LineOfCreditFacilityConversionRepaymentPercentageInFinalQuarterOfYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Amount included in the current portion of long-term debt				$ 2,000,000us-gaap_LinesOfCreditCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember

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Represents the percentage of outstanding loan balance to be repaid in final quarter of second year of the term period if the facility is converted to a two-year term loan subject to annual review under the financing agreement.

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Represents the percentage of outstanding loan balance to be repaid per quarter for first three quarters in second year of the term period if the facility is converted to a two-year term loan subject to annual review under the financing agreement.

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Represents the percentage of outstanding loan balance to be repaid per quarter in first year of the term period if the facility is converted to a two-year term loan subject to annual review under the financing agreement.

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Represents the term loan period into which the line of credit facility will be converted if term date is not extended upon annual review.

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Represents the period for which no debt repayments are required if the facility is renewed subject to annual review under the financing agreement.

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Represents the number of residential parcels sold to date.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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