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Note 7 - Deferred Rent (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Deferred Rent [Table Text Block] |
(In thousands) |  | 2018 |
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 Tabular disclosure of deferred rent. + References No definition available. + Details
Name: | blfs_ScheduleOfDeferredRentTableTextBlock
Namespace Prefix: | blfs_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration