XML 48 R38.htm IDEA: XBRL DOCUMENT v3.25.3

Note 5 - Derivatives and Hedging Activities - Schedule of Derivative Instrument Classification (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Derivative fair value	$ (136,097)	$ 677,761
Interest Rate Swap [Member] | Other Assets [Member] | Cash Flow Hedging [Member]
Derivative fair value	(187,703)	651,340
Interest Rate Swap [Member] | Other Assets [Member] | Fair Value Hedging [Member]
Derivative fair value	(184,691)	109,594
Interest Rate Swap [Member] | Notes Receivable, Net [Member] | Fair Value Hedging [Member]
Derivative fair value	$ 236,297	$ (83,173)

X

- Definition

Aggregate net fair value of all derivative instruments designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsInHedgesAtFairValueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=bsbk_NotesReceivableNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: