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SEGMENT AND GEOGRAPHIC INFORMATION (Details) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Revenues:    
Total before gain on sale of investments and interest income $ 28,017,000us-gaap_SalesRevenueNet $ 24,563,000us-gaap_SalesRevenueNet
Gain on sale of investments 3,399,000us-gaap_GainOnSaleOfInvestments  
Interest income 29,000us-gaap_InvestmentIncomeInterest 45,000us-gaap_InvestmentIncomeInterest
Total revenues 31,445,000us-gaap_Revenues 24,608,000us-gaap_Revenues
Depletion, depreciation, and amortization:    
Total depletion, depreciation, and amortization 6,391,000us-gaap_DepreciationDepletionAndAmortization 8,542,000us-gaap_DepreciationDepletionAndAmortization
Reduction of carrying value of assets:    
Reduction of carrying value of assets   4,506,000us-gaap_AssetImpairmentCharges
Operating profit (loss) (before general and administrative expenses):    
Total operating profit (loss) 7,686,000us-gaap_OperatingIncomeLoss (716,000)us-gaap_OperatingIncomeLoss
Equity in loss of affiliates:    
Equity in loss of affiliates (482,000)us-gaap_IncomeLossFromEquityMethodInvestments  
General and administrative expenses (8,026,000)us-gaap_GeneralAndAdministrativeExpense (8,911,000)us-gaap_GeneralAndAdministrativeExpense
Interest expense (664,000)us-gaap_InterestExpense (587,000)us-gaap_InterestExpense
Gain on sale of investments 3,399,000us-gaap_GainOnSaleOfInvestments  
Interest income 29,000us-gaap_InvestmentIncomeInterest 45,000us-gaap_InvestmentIncomeInterest
Income (loss) before income taxes 1,942,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (10,169,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Capital Expenditures:    
Capital Expenditure 4,923,000us-gaap_PaymentsToAcquireProductiveAssets 7,525,000us-gaap_PaymentsToAcquireProductiveAssets
Assets By Segment:    
Total assets 54,770,000us-gaap_Assets 62,714,000us-gaap_Assets
Intersegment elimination    
Revenues:    
Total revenues 0us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
Oil and natural gas    
Revenues:    
Total before gain on sale of investments and interest income 20,298,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
21,376,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
Depletion, depreciation, and amortization:    
Total depletion, depreciation, and amortization 5,968,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
8,034,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
Reduction of carrying value of assets:    
Reduction of carrying value of assets   4,506,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
Operating profit (loss) (before general and administrative expenses):    
Total operating profit (loss) 5,416,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
(1,156,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
Capital Expenditures:    
Capital Expenditure 4,824,000us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
7,506,000us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
Assets By Segment:    
Total assets 20,951,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
40,559,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= brn_OilAndNaturalGasMember
Land investment    
Revenues:    
Total before gain on sale of investments and interest income 636,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= brn_LandInvestmentMember
282,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= brn_LandInvestmentMember
Operating profit (loss) (before general and administrative expenses):    
Total operating profit (loss) 636,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= brn_LandInvestmentMember
282,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= brn_LandInvestmentMember
Equity in loss of affiliates:    
Equity in loss of affiliates (482,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= brn_LandInvestmentMember
 
Assets By Segment:    
Total assets 7,039,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= brn_LandInvestmentMember
2,381,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= brn_LandInvestmentMember
Contract drilling    
Revenues:    
Total before gain on sale of investments and interest income 6,287,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= brn_ContractDrillingMember
2,338,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= brn_ContractDrillingMember
Depletion, depreciation, and amortization:    
Total depletion, depreciation, and amortization 309,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= brn_ContractDrillingMember
394,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= brn_ContractDrillingMember
Operating profit (loss) (before general and administrative expenses):    
Total operating profit (loss) 952,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= brn_ContractDrillingMember
(295,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= brn_ContractDrillingMember
Capital Expenditures:    
Capital Expenditure 48,000us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= brn_ContractDrillingMember
17,000us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= brn_ContractDrillingMember
Assets By Segment:    
Total assets 1,849,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= brn_ContractDrillingMember
2,905,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= brn_ContractDrillingMember
Residential real estate    
Assets By Segment:    
Total assets 5,448,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ResidentialRealEstateMember
5,448,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ResidentialRealEstateMember
Other    
Revenues:    
Total before gain on sale of investments and interest income 796,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
567,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Depletion, depreciation, and amortization:    
Total depletion, depreciation, and amortization 114,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
114,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Operating profit (loss) (before general and administrative expenses):    
Total operating profit (loss) 682,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
453,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Capital Expenditures:    
Capital Expenditure 51,000us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
2,000us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Other | Cash and cash equivalents    
Assets By Segment:    
Total assets 16,104,000us-gaap_Assets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
7,828,000us-gaap_Assets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Corporate and other    
Assets By Segment:    
Total assets $ 3,379,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ 3,593,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember