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Assets held for rent - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |
Assets held for rent, depreciation expense | $ 0.9 | $ 0.9 | $ 2.8 | $ 2.7

X
- Definition The amount of depreciation expenses recognized for assets held for rent. + References No definition available. + Details
Name: | blfs_AssetsHeldForRentDepreciation
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration