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SHARE-BASED PAYMENTS (Details 2) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Shares    
Granted (in shares)   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-based payments, additional disclosures    
Total unrecognized compensation cost $ 64,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions  
Components of the total share-based compensation    
Total share based compensation (benefit) expense (380,000)us-gaap_AllocatedShareBasedCompensationExpense (73,000)us-gaap_AllocatedShareBasedCompensationExpense
Equity-classified share options    
Assumptions used in estimating fair value    
Expected volatility (as a percent) 55.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Expected dividends (as a percent) 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Expected term 10 years  
Risk-free interest rate (as a percent) 3.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Expected forfeitures (as a percent) 0.00%brn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Shares    
Outstanding at the beginning of the period (in shares) 60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Granted (in shares) 30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Outstanding at the end of the period (in shares) 90,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Exercisable at the end of period (in shares) 60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Weighted-Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 8.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Granted (in dollars per share) $ 3.01us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Outstanding at the end of the period (in dollars per share) $ 6.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 8.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Exercisable at the end of period (in dollars per share) $ 8.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Weighted-Average Remaining Contractual Term    
Options outstanding, weighted average contractual life 3 years 2 months 12 days  
Options exercisable, weighted average contractual life 2 months 12 days  
Components of the total share-based compensation    
Total share based compensation (benefit) expense 26,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Liability-classified share options    
Assumptions used in estimating fair value    
Expected volatility range, minimum (as a percent) 29.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
47.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Expected volatility range, maximum (as a percent) 57.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
64.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Weighted-average volatility (as a percent) 45.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
58.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Expected dividends (as a percent) 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Risk-free interest rate, minimum (as a percent) 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Risk-free interest rate, maximum (as a percent) 2.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
1.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Expected forfeitures (as a percent) 0.00%brn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
0.00%brn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Shares    
Outstanding at the beginning of the period (in shares) 717,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
 
Granted (in shares) 30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
 
Outstanding at the end of the period (in shares) 747,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
717,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Exercisable at the end of period (in shares) 717,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
 
Weighted-Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 8.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
 
Granted (in dollars per share) $ 3.01us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
 
Outstanding at the end of the period (in dollars per share) $ 8.15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
$ 8.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Exercisable at the end of period (in dollars per share) $ 8.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
 
Weighted-Average Remaining Contractual Term    
Options outstanding, weighted average contractual life 3 years 7 months 6 days  
Options exercisable, weighted average contractual life 3 years 4 months 24 days  
Components of the total share-based compensation    
Due to vesting 21,000brn_ShareBasedCompensationExpenseDueToVesting
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
46,000brn_ShareBasedCompensationExpenseDueToVesting
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Due to remeasurement (427,000)brn_ShareBasedCompensationExpenseBenefitDueToRemeasurement
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
(119,000)brn_ShareBasedCompensationExpenseBenefitDueToRemeasurement
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Total share based compensation (benefit) expense $ (406,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
$ (73,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= brn_LiabilityClassifiedShareOptionsMember
Liability-classified share options | Minimum    
Assumptions used in estimating fair value    
Expected term 2 months 12 days 1 year 2 months 12 days
Liability-classified share options | Maximum    
Assumptions used in estimating fair value    
Expected term 9 years 2 months 12 days 6 years 2 months 12 days