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SHARE-BASED PAYMENTS (Details 2) (USD $) | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Shares |  |
Granted (in shares) |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-based payments, additional disclosures |  |
Total unrecognized compensation cost | $ 64,000 us-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) | 60,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
Granted (in shares) | 30,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
Outstanding at the end of the period (in shares) | 90,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 60,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Exercisable at the end of period (in shares) | 60,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
Weighted-Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 8.62 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
Granted (in dollars per share) | $ 3.01 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
Outstanding at the end of the period (in dollars per share) | $ 6.75 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 8.62 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Exercisable at the end of period (in dollars per share) | $ 8.62 us-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 | 26,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 0 us-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) | 717,250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = brn_LiabilityClassifiedShareOptionsMember |
Granted (in shares) | 30,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = brn_LiabilityClassifiedShareOptionsMember |
Outstanding at the end of the period (in shares) | 747,250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = brn_LiabilityClassifiedShareOptionsMember | 717,250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = brn_LiabilityClassifiedShareOptionsMember
Exercisable at the end of period (in shares) | 717,250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = brn_LiabilityClassifiedShareOptionsMember |
Weighted-Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 8.37 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = brn_LiabilityClassifiedShareOptionsMember |
Granted (in dollars per share) | $ 3.01 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = brn_LiabilityClassifiedShareOptionsMember |
Outstanding at the end of the period (in dollars per share) | $ 8.15 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = brn_LiabilityClassifiedShareOptionsMember | $ 8.37 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = brn_LiabilityClassifiedShareOptionsMember
Exercisable at the end of period (in dollars per share) | $ 8.37 us-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 | 21,000 brn_ShareBasedCompensationExpenseDueToVesting / us-gaap_AwardTypeAxis = brn_LiabilityClassifiedShareOptionsMember | 46,000 brn_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

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