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Note 20 - Subsequent Events (Details Textual) | Oct. 01, 2022 USD ($) ft² | Sep. 30, 2022 USD ($)
--- | --- | ---
Operating Lease, Liability, Total |  | $ 17,243,000
Subsequent Event [Member] | Lease in Woodinville, WA [Member] |  |
Area of Real Estate Property (Square Foot) | ft² | 13,578 |
Operating Lease, Liability, Total | $ 1,500,000 |
Monthly Base Rent Expense | $ 19,338 |

X
- Definition Amount of monthly base rent expense. + References No definition available. + Details
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Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |