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Liquidity (Details Narrative)	Sep. 30, 2021 USD ($)
Liquidity
[custom:WorkingCapital-0]	$ 19,300,000

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- References

No definition available.

+ Details

Name:	bivi_DisclosureLiquidityAbstract
Namespace Prefix:	bivi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	bivi_WorkingCapital
Namespace Prefix:	bivi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant