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Note 13 - Revenue - Summary of Remaining Performance Obligations 2 (Details) $ in Thousands | Mar. 31, 2022 USD ($)
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Rental Revenue [Member] |
Service revenue, expected to be recognized in the future | $ 11,703
Rental Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 |
Service revenue, expected to be recognized in the future | $ 7,068
Service revenue, expected to be recognized in the future, period (Year) | 9 months
Rental Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |
Service revenue, expected to be recognized in the future | $ 3,735
Service revenue, expected to be recognized in the future, period (Year) | 1 year
Rental Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Service revenue, expected to be recognized in the future | $ 900
Service revenue, expected to be recognized in the future, period (Year) | 1 year
Service Revenue [Member] |
Service revenue, expected to be recognized in the future | $ 205
Service Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 |
Service revenue, expected to be recognized in the future | $ 79
Service revenue, expected to be recognized in the future, period (Year) | 9 months
Service Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |
Service revenue, expected to be recognized in the future | $ 116
Service revenue, expected to be recognized in the future, period (Year) | 1 year
Service Revenue [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Service revenue, expected to be recognized in the future | $ 10
Service revenue, expected to be recognized in the future, period (Year) | 1 year

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
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- Details
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- Details
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- Details
Name: | srt_ProductOrServiceAxis=blfs_ServiceRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |