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Note 1 - Organization and Significant Accounting Policies - Summary of Remaining Performance Obligations (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Service Revenue [Member] |
Service revenue, expected to be recognized in the future | $ 4,553

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_ProductOrServiceAxis=blfs_ServiceRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |