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Note 6 - Assets Held for Rent (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Assets Held for Rent, Depreciation | $ 868,000 | $ 299,000 | $ 1,800,000 | $ 483,000

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