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COMMITMENTS AND CONTINGENCIES (Detail) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Operating leases    
Rental expense $ 548,000us-gaap_LeaseAndRentalExpense $ 521,000us-gaap_LeaseAndRentalExpense
Minimum rental payments    
2015 305,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent  
2016 299,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
2017 264,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears  
2018 154,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears  
2019 134,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears  
Thereafter through 2026 403,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter  
Total 1,559,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue  
Commitments and contingencies    
Accrual for environmental remediation costs 501,000us-gaap_AccrualForEnvironmentalLossContingencies 783,000us-gaap_AccrualForEnvironmentalLossContingencies
Kaupulehu Developments    
Commitments and contingencies    
Fees to be paid to Nearco (as a percent) 10.40%brn_PropertyPromotionAndMarketingFeePercentFee
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
 
Percentage of Increment II receipts to be paid to external real estate counsel for services provided in the negotiation and closing of the Increment II transaction 1.50%brn_PropertyLegalFeesPercentage
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
 
Amounts paid pursuant to the arrangement $ 0brn_LossContingencyFeesPaidToRealEstateLegalCounselValue
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember
$ 0brn_LossContingencyFeesPaidToRealEstateLegalCounselValue
/ dei_LegalEntityAxis
= brn_KaupulehuDevelopmentsMember