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v3.19.3.a.u2

RELATED-PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
RELATED-PARTY TRANSACTIONS |  |
Fees and Reimbursed Travel Costs | $ 75 | $ 62
LS Associates [Member] |  |
RELATED-PARTY TRANSACTIONS |  |
Consulting fees | $ 156 | $ 298

X
- Definition Amount of consulting fees. + References No definition available. + Details
Name: | basi_ConsultingFees
Namespace Prefix: | basi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition It represent the amount of fees and reimbursed travel costs. + References No definition available. + Details
Name: | basi_FeesAndReimbursedTravelCosts
Namespace Prefix: | basi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | basi_ConsultingAgreementAxis=basi_LsAssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |