Represents the percentage of equity issuable shares held in escrow accounts for post-closing indemnification claims.

No definition available.

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Namespace Prefix:	blfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of monthly base rent expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	blfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the percentage increase (decrease) in operating lease each year.

+ References

No definition available.

+ Details

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Namespace Prefix:	blfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=blfs_TheMergerAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseContractualTermAxis=blfs_LeaseAgreementInTheUnitedStatesBeginningJune12021Member
Namespace Prefix:
Data Type:	na
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Note 14 - Subsequent Events (Details Textual)				12 Months Ended
Note 14 - Subsequent Events (Details Textual)	Mar. 19, 2021 shares	Jan. 29, 2021 USD ($) a	Jan. 04, 2021 USD ($) ft²	Dec. 31, 2020 USD ($) ft²
The United States of America [Member]
Area of Real Estate Property (Square Foot) \| ft²				16,153
Monthly Base Rent Expense				$ 13,000
Subsequent Event [Member] \| The Merger Agreement [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) \| shares	6,646,870
Business Acquisition, Percentage of Equity Issuable Shares Held in Escrow Accounts for Post Closing Claims	19.90%
Subsequent Event [Member] \| The United States of America [Member]
Area of Real Estate Property (Square Foot) \| ft²			16,800
Monthly Base Rent Expense			$ 13,650
Yearly Percentage Increase (Decrease) in Operating Lease			3.00%
Subsequent Event [Member] \| Lease Agreement in the United States Beginning June 1, 2021 [Member]
Area of Real Estate Property (Square Foot) \| a		26,800
Monthly Base Rent Expense		$ 26,800
Yearly Percentage Increase (Decrease) in Operating Lease		2.50%
Lessee, Operating Lease, Term of Contract (Year)		10 years