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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Factored Receivable Unpaid Principal Balance	$ 5,400,000	$ 187,000
Factored Receivable, Customer Reserves	$ 1,300,000	$ 122,000

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