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Note 10 - Warrants - Summary of Warrant Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Outstanding, Number (in shares) | 4,080,005 | 6,688,849
Outstanding, Weighted average exercise price (in dollars per share) | $ 4.35 | $ 4.50
Exercised, Number (in shares) | (121,000) | (2,608,844)
Exercised, Weighted average exercise price (in dollars per share) | $ 4.75 | $ 4.75
Outstanding, Number (in shares) | 3,959,005 | 4,080,005
Outstanding, Weighted average exercise price (in dollars per share) | $ 4.33 | $ 4.35

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

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- 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 http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num: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