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Note 4 - Assets Held for Rent - Assets Held for Rent (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Shippers placed in service | $ 3,171 | $ 3,073
Accumulated depreciation | (411) | (174)
Net | 2,760 | 2,899
Shippers and related components in production | 1,945 | 1,023
Total | $ 4,705 | $ 3,922

X
- Definition The carrying value of assets held for rent. + References No definition available. + Details
Name: | blfs_AssetsHeldForRent
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_ShippersPlacedInServiceGross
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
- Definition Amount of depreciation related to shippers placed in service. + References No definition available. + Details
Name: | blfs_ShippresPlacedInServiceDepreciation
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration