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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Factored Receivable Unpaid Principal Balance	$ 3,500,000	$ 5,900,000
Factored Receivable, Customer Reserves	$ 755,000	$ 2,100,000

X

- Definition

Represents customer reserve related to factored receivables.

+ References

No definition available.

+ Details

Name:	bfin_FactoredReceivableCustomerReserves
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents factored receivable unpaid principal balance.

+ References

No definition available.

+ Details

Name:	bfin_FactoredReceivableUnpaidPrincipalBalance
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant