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Note 9 - Warrants - Summary of Warrant Activity (Details) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Beginning balance (in shares) | 0 | 79,100
Beginning balance (in dollars per share) | $ 0 | $ 4.75
Exercised, number of shares (in shares) | 0 | (79,100)
Exercised, weighted average exercise price (in dollars per share) | $ 0 | $ 4.75
Ending balance (in shares) | 0 | 0
Ending balance (in dollars per share) | $ 0 | $ 0

X
- Definition The number of warrants or rights exercised during period. + References No definition available. + Details
Name: | blfs_ClassOfWarrantOrRightExercisedDuringPeriod
Namespace Prefix: | blfs_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share of warrants or rights exercised during period. + References No definition available. + Details
Name: | blfs_ClassOfWarrantOrRightExercisedDuringPeriodExercisePrice
Namespace Prefix: | blfs_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant