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Note 4 - Assets Held for Rent (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Scheduleof Assets Held for Rent [Table Text Block] |
(In thousands) |  | 2020 |  |  | 2019 |
Shippers placed in service |  | $ | 3,171 |  |  | $ | 3,073 |
Accumulated depreciation |  |  | (411 | ) |  |  | (174 | )
Net |  |  | 2,760 |  |  |  | 2,899 |
Shippers and related components in production |  |  | 1,945 |  |  |  | 1,023 |
Total |  | $ | 4,705 |  |  | $ | 3,922 |

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- Definition Tabular disclosure of assets held for rent. + References No definition available. + Details
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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