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Note 11 - Investment in Debt Security (Details Textual) - Debt Security, Corporate, Non-US [Member]	Sep. 30, 2021 USD ($)	Jun. 30, 2020 HKD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 HKD ($)
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Current			$ 512,821	$ 4,000,000
Limit of Bond		$ 20,000,000
Investment in Held-to-maturity Debt Securities, Interest Rate		5.00%
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Noncurrent	$ 250,000

X

- Definition

Represents the interest rate of an investment in held-to-maturity debt securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	bkyi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the limit of a bond held for investment.

+ References

No definition available.

+ Details

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Namespace Prefix:	bkyi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity), classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity), classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26626-111562

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Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: