XML 72 R50.htm IDEA: XBRL DOCUMENT
v3.21.1

Note 4 - Assets Held for Rent (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Assets Held for Rent, Depreciation | $ 671,000 | $ 174,000

X
- Definition The amount of depreciation expenses recognized for assets held for rent. + References No definition available. + Details
Name: | blfs_AssetsHeldForRentDepreciation
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration