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Note 7 - Deferred Rent - Summary of Deferred Rent (Details) $ in Thousands | Dec. 31, 2018 USD ($)
--- | ---
Landlord-funded leasehold improvements | $ 1,125
Less accumulated amortization | (757)
Total (current portion $130 December 31, 2018) | 368
Straight line rent adjustment | 111
Total deferred rent | $ 479

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- Definition Amount of accumulated amortization of landlord-funded leasehold improvements. + References No definition available. + Details
Name: | blfs_LandlordfundedLeaseholdImprovementsAccumulatedAmortization
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of landlord-funded leasehold improvements before accumulated amortization. + References No definition available. + Details
Name: | blfs_LandlordfundedLeaseholdImprovementsGross
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of straight-line rent adjustment. + References No definition available. + Details
Name: | blfs_StraightlineRentAdjustment
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121549951&loc=d3e39896-112707 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant