Unaudited Condensed Consolidated Statements of Shareholders' Equity (Parentheticals) - shares	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021
Cashless warrant exercises (in shares)	(0)	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