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Assets held for rent - Schedule of Assets Held for Rent (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Shippers placed in service | $ 9,096 | $ 9,505
Accumulated depreciation | (6,392) | (6,499)
Net | 2,704 | 3,006
Shippers and related components in production | 2,603 | 3,097
Total | $ 5,307 | $ 6,103

X
- Definition The carrying value of shippers and related components in production. + References No definition available. + Details
Name: | blfs_ShippersAndRelatedComponentsInProduction
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The gross value of shippers placed in service. + References No definition available. + Details
Name: | blfs_ShippersPlacedInService
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cumulative amount of depreciation, related to related to shippers placed in service and fixed assets held for rent. + References No definition available. + Details
Name: | blfs_ShippersPlacedInServiceAccumulatedDepreciation
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents shippers placed in service and fixed assets held for rent, net + References No definition available. + Details
Name: | blfs_ShippersPlacedInServiceAndFixedAssetsHeldForRentNet
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying value of shippers placed in service, net of accumulated depreciation. + References No definition available. + Details
Name: | blfs_ShippersPlacedInServiceNet
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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