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Note 5 - Assets Held for Rent - Assets Held for Rent (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Shippers placed in service	$ 1,577
Accumulated deprecation	(51)
Net	1,526
Shippers and related components in production	1,450
Total	$ 2,976

X

- Definition

The carrying value of assets held for rent.

+ References

No definition available.

+ Details

Name:	blfs_AssetsHeldForRent
Namespace Prefix:	blfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying value of shippers and related components in production.

+ References

No definition available.

+ Details

Name:	blfs_ShippersAndRelatedComponentsInProduction
Namespace Prefix:	blfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The gross value of shippers placed in service.

+ References

No definition available.

+ Details

Name:	blfs_ShippersPlacedInServiceGross
Namespace Prefix:	blfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying value of shippers placed in service, net of accumulated depreciation.

+ References

No definition available.

+ Details

Name:	blfs_ShippersPlacedInServiceNet
Namespace Prefix:	blfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The cumulative amount of depreciation related to shippers placed in service.

+ References

No definition available.

+ Details

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