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Consolidated Statements of Shareholders' Equity (Parentheticals) - shares |  | 12 Months Ended
--- | --- | ---
May 14, 2020 | Dec. 31, 2020 | Dec. 31, 2019
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 | 121,000

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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: |