Number of additional shares of equity interests retained in escrow issued or issuable to acquire entity.

No definition available.

Name:	blfs_BusinessAcquisitionEquityInterestRetainedInEscrowIssuedOrIssuableAdditionalNumberOfShares
Namespace Prefix:	blfs_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of monthly base rent expense.

+ References

No definition available.

+ Details

Name:	blfs_MonthlyBaseRentExpense
Namespace Prefix:	blfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=blfs_GCIAcquisitionMember
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_LeaseContractualTermAxis=blfs_TheNetherlandsLeaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 16 - Subsequent Events (Details Textual)			3 Months Ended
Note 16 - Subsequent Events (Details Textual)	May 03, 2021 shares	Apr. 01, 2021 EUR (€) a	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Business Combination, Acquisition Related Costs			$ 998,000	$ 225,000
GCI Acquisition [Member]
Business Combination, Acquisition Related Costs			902,000
Subsequent Event [Member] \| GCI Acquisition [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) \| shares	6,038,252
Business Acquisition, Equity Interest Retained in Escrow Issued or Issuable, Additional Number of Shares (in shares) \| shares	598,218
The Netherlands Lease Agreement [Member]
Monthly Base Rent Expense			$ 33,734
The Netherlands Lease Agreement [Member] \| Subsequent Event [Member]
Area of Real Estate Property (Square Foot) \| a		47,533
Monthly Base Rent Expense \| €		€ 28,726