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v3.10.0.1

RELATED-PARTY TRANSACTIONS (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Related Party Transaction [Line Items] |  |
Fees and Reimbursed Travel Costs | $ 62 | $ 22

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