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Note V - Subsequent Events (Details Textual) - USD ($)	May 06, 2024	Mar. 31, 2024	Mar. 27, 2024	Feb. 15, 2024	Jan. 12, 2024	Jan. 05, 2024	Jan. 04, 2024
Restricted Stock [Member] | Share-Based Payment Arrangement, Employee [Member] | Forecast [Member]
Shares Issued, Shares, Share-Based Payment Arrangement, Forfeited (in shares)	186
Subsequent Event [Member]
Stock Issued During Period, Shares, Exercise of Warrants					$ 158,000	$ 142,000	$ 347,000
Subsequent Event [Member] | Common Stock [Member] | Stock Issued in Lieu of Board Fees [Member] | Director [Member]
Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture (in shares)			4,287
Subsequent Event [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Employee [Member]
Shares Issued, Shares, Share-Based Payment Arrangement, Forfeited (in shares)		73		243

X

- Definition

Number of new stock issued during the period for the exercise of warrants.

+ References

No definition available.

+ Details

Name:	bkyi_StockIssuedDuringPeriodSharesExerciseOfWarrants
Namespace Prefix:	bkyi_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares (or other type of equity) forfeited during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GranteeStatusAxis=us-gaap_ShareBasedPaymentArrangementEmployeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=bkyi_StockIssuedInLieuOfBoardFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_TitleOfIndividualAxis=srt_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: