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v3.23.1

Note P - Equity - Summary of Warrant Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Outstanding, warrants (in shares) | 4,689,387 | 4,689,387 |
Outstanding, weighted average exercise price, warrants (in dollars per share) | $ 6.04 | $ 6.04 |
Outstanding, weighted average remaining contractual life, warrants (Year) | 2 years 7 months 2 days | 3 years 5 months 23 days | 4 years 5 months 23 days
Granted, warrants (in shares) | 200,000 |  |
Granted, weighted average exercise price, warrants (in dollars per share) | $ 3.00 |  |
Exercised, warrants (in shares) |  | 0 |
Exercised, weighted average exercise price, warrants (in dollars per share) | $ 0 | $ 0 |
Forfeited, warrants (in shares) | 0 | 0 |
Forfeited, weighted average exercise price, warrants (in dollars per share) | $ 0 | $ 0 |
Expired, warrants (in shares) | (17,362) | 0 |
Expired, weighted average exercise price, warrants (in dollars per share) | $ 28.80 | $ 0 |
Forfeited, weighted average exercise price, warrants (in dollars per share) | $ 0 | $ 0 |
Outstanding, warrants (in shares) | 4,872,025 | 4,689,387 | 4,689,387
Outstanding, weighted average exercise price, warrants (in dollars per share) | $ 5.83 | $ 6.04 | $ 6.04
Public Offering Warrants [Member] |  |  |
Granted, warrants (in shares) |  | 0 |
Granted, weighted average exercise price, warrants (in dollars per share) |  | $ 0 |
Pre-Funded Warrants [Member] |  |  |
Exercised, warrants (in shares) | 0 |  |

X
- Definition The amount of warrants granted during the period. + References No definition available. + Details
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Namespace Prefix: | bkyi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of warrants exercised during period. + References No definition available. + Details
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Namespace Prefix: | bkyi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants expired during period. + References No definition available. + Details
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Namespace Prefix: | bkyi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants forfeited during period. + References No definition available. + Details
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Namespace Prefix: | bkyi_
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Balance Type: | na
Period Type: | duration

X
- Definition Warrants outstanding exercise price. + References No definition available. + Details
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Namespace Prefix: | bkyi_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Warrants outstanding weighted average remaining life. + References No definition available. + Details
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Namespace Prefix: | bkyi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price of the warrants exercised in the period. + References No definition available. + Details
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Namespace Prefix: | bkyi_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted average exercise price of the warrants expired during period. + References No definition available. + Details
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Namespace Prefix: | bkyi_
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- Definition Weighted average exercise price of the warrants forfeited. + References No definition available. + Details
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Namespace Prefix: | bkyi_
Data Type: | dtr-types:perShareItemType
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Period Type: | duration

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- Definition Weighted average exercise price of warrants granted during period. + References No definition available. + Details
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Namespace Prefix: | bkyi_
Data Type: | dtr-types:perShareItemType
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X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |