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Note 8 - Income Taxes - Change in Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Balance at January 1 | $ 8,498 | $ 8,706 | $ 8,345
Deferred tax liabilities assumed through acquisitions | (8,498) | (3,297) | (1,541)
Charged to income tax expense | 2,493 | 3,089 | 1,902
Balance at December 31 | $ 2,493 | $ 8,498 | $ 8,706

X
- Definition The amount of deferred tax assets valuation allowance charged to income tax expense. + References No definition available. + Details
Name: | blfs_DeferredTaxAssetsValuationAllowanceChargedToIncomeTaxExpense
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of deferred tax liabilities assumed through acquisitions. + References No definition available. + Details
Name: | blfs_DeferredTaxLiabilitiesAssumedThroughAcquisitions
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant