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Note 7 - Assets Held for Rent - Assets Held for Rent (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Shippers placed in service | $ 8,132 | $ 7,671
Fixed assets held for rent | 4,686 | 4,686
Accumulated depreciation | (5,451) | (4,952)
Subtotal | 7,367 | 7,405
Shippers and related components in production | 1,638 | 1,659
Total | $ 9,005 | $ 9,064

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 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 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