Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parentheticals) - shares		3 Months Ended
May 14, 2020	Mar. 31, 2021
WAVI Holding AG and Taurus4757 GmbH Warrants [Member]
Cashless warrant exercises (in shares)	3,871,405	79,100
Cashless warrant exercises (in shares)		79,100

The number of warrants or rights exercised during period.

No definition available.

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