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Note 11 - Long-term Debt (Details Textual) - The 2022 Term Loan 3 [Member] $ in Millions	Sep. 30, 2022 USD ($)
Debt Instrument, Maximum Borrowing Capacity	$ 50
Debt Instrument, Maximum Borrowing Capacity at Closing	30
Debt Instrument, Additional Maximum Amount Within Nine Months After Closing	10
Debt Instrument, Face Amount	$ 20
Debt Instrument, Interest Rate, Maximum Stated Percentage for Each Tranche Borrowed	1.00%
Debt Instrument, Additional Maximum Amount Upon Certain Milestone Acheivements	$ 10
Debt Instrument, Additional Maximum At Discretion of Lender	$ 10
Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%

X

- Definition

Amount of additional maximum capacity upon achievement of certain milestones.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The maximum amount of addiotnal borrowing capacity within 9 months of closing.

+ References

No definition available.

+ Details

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Namespace Prefix:	blfs_
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X

- Definition

Amount of additional maximum borrowing at the discretion of the lender.

+ References

No definition available.

+ Details

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Namespace Prefix:	blfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents maximum stated intertest rate for each tranche borrowed.

+ References

No definition available.

+ Details

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Namespace Prefix:	blfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents maximum borrowing capacity.

+ References

No definition available.

+ Details

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Namespace Prefix:	blfs_
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X

- Definition

Represents maximum borrowing capacity at closing.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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X

- Details

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X

- Details

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