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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parentheticals) - shares		9 Months Ended
	May 14, 2020	Sep. 30, 2020
WAVI Holding AG and Taurus4757 GmbH Warrants [Member]
Cashless warrant exercises (in shares)	3,871,405	3,871,405
Cashless warrant exercises (in shares)		3,879,905

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- Definition

The number of warrants or rights exercised during period.

+ References

No definition available.

+ Details

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Namespace Prefix:	blfs_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=blfs_WaviHoldingAgAndTaurus4757GmbhWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: