SELF-INSURANCE (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012
SELF-INSURANCE [Abstract]
Self insurance exposure for individual claims	$ 75
Minimum annual aggregate attachment point	85
Self-insured employee health plan expenses	$ 1,035	$ 1,231

Represents the employer's minimum overall limit of claim liability, which is adjusted based on the size of the group insured, as of the balance sheet date.

No definition available.

Name:	basi_AnnualAggregateAttachmentPointMinimum
Namespace Prefix:	basi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant