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Note 11 - Acquisitions - Consideration (Details) (Parentheticals) | Aug. 08, 2019
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SAVSU [Member] |
Percentage equity interest purchased | 56.00%

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=blfs_SAVSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |