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Note 5 - Assets Held for Rent - Assets Held for Rent (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Shippers placed in service | $ 5,433 | $ 3,171
Fixed assets held for rent | 3,603 | 0
Accumulated depreciation | (1,284) | (411)
Net | 7,752 | 2,760
Shippers and related components in production | 2,334 | 1,945
Total | $ 10,086 | $ 4,705

X
- Definition Represents the fixed assets held for rent. + References No definition available. + Details
Name: | blfs_FixedAssetsHeldForRent
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 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 Amount of depreciation related to shippers placed in service. + References No definition available. + Details
Name: | blfs_ShippersPlacedInServiceDepreciation
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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