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v3.20.1

Note 5 - Assets Held for Rent (Details Textual) | 12 Months Ended
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Dec. 31, 2019 USD ($)
Shippers Placed in Service, Accumulated Depreciation | $ 174,000

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