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INCOME TAXES (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Income Taxes [Line Items]      
Cash paid for income taxes $ 17us-gaap_IncomeTaxesPaid $ 3us-gaap_IncomeTaxesPaid  
Liability for other uncertain income tax positions 16us-gaap_UnrecognizedTaxBenefits 16us-gaap_UnrecognizedTaxBenefits 16us-gaap_UnrecognizedTaxBenefits
Impairment of goodwill 374us-gaap_GoodwillImpairmentLoss     
Alternative Minimum Tax Credit Carryforward [Member]      
Income Taxes [Line Items]      
Tax credit carryforwards 58us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= basi_AlternativeMinimumTaxCreditCarryforwardMember
   
Foreign Tax Authority [Member]      
Income Taxes [Line Items]      
Net operating loss carry forwards   8,626us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
 
Internal Revenue Service (IRS) [Member]      
Income Taxes [Line Items]      
Net operating loss carry forwards 11,959us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
   
Valuation allowance 1,718us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
2,286us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
 
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Expirations of operating loss carry forwards Sep. 30, 2015    
Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]      
Income Taxes [Line Items]      
Expirations of operating loss carry forwards Sep. 30, 2032    
State [Member]      
Income Taxes [Line Items]      
Net operating loss carry forwards $ 15,744us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
   
State [Member] | Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Expirations of operating loss carry forwards Sep. 30, 2015    
State [Member] | Latest Tax Year [Member]      
Income Taxes [Line Items]      
Expirations of operating loss carry forwards Sep. 30, 2032