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v3.21.2

Note 17 - Subsequent Events (Details Textual) |  |  | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2021 USD ($) | Oct. 08, 2021 USD ($) ft² | Sep. 30, 2021 USD ($)
Albuquerque, New Mexico Location [Member] |  |  |
Monthly Base Rent Expense |  |  | $ 9,000
Subsequent Event [Member] | Bothell Washington Headquarters 2 [Member] |  |  |
Area of Leased Real Estate Property Increase (Decrease) (Square Foot) | ft² |  | 8,342 |
Lease Agreement, Tenant Allowance |  | $ 417,000 |
Monthly Base Rent Increase (Decrease) |  | $ 19,000 |
Lease Obligation Incurred, Percentage, Annual Increase |  | 3.00% |
Subsequent Event [Member] | Albuquerque, New Mexico Location [Member] |  |  |
Monthly Base Rent Expense | $ 10,000 |  |

X
- Definition The area increase (decrease) of leased real estate property. + References No definition available. + Details
Name: | blfs_AreaOfLeasedRealEstatePropertyIncreaseDecrease
Namespace Prefix: | blfs_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the tenant allowance to be received under the lease agreement. + References No definition available. + Details
Name: | blfs_LeaseAgreementTenantAllowance
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents percentage of annual lease expense increase. + References No definition available. + Details
Name: | blfs_LeaseObligationIncurredPercentageAnnualIncrease
Namespace Prefix: | blfs_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Definition Represents amount of monthly base rent increase (decrease). + References No definition available. + Details
Name: | blfs_MonthlyBaseRentIncreaseDecrease
Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=blfs_AlbuquerqueNewMexicoLocationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=blfs_BothellWashingtonHeadquarters2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |