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Note 7 - Deferred Rent - Summary of Deferred Rent (Details) (Parentheticals) $ in Thousands | Dec. 31, 2018 USD ($)
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Current portion | $ 130

X
- Definition Current portion of amount of landlord-funded leasehold improvements after accumulated amortization. + References No definition available. + Details
Name: | blfs_LandlordfundedLeaseholdImprovementsNetCurrent
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant