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Note 9 - Investments (Details Textual) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 HKD ($) | Dec. 31, 2018 USD ($)
Debt Securities, Held-to-maturity, Current | $ 512,821 | $ 4,000,000 |
Investment in Held-to-maturity Debt Securities, Term | 1 year |  |
Investment in Held-to-maturity Debt Securities, Interest Rate | 5.00% | 5.00% |
Limit of Bond |  | $ 20,000,000 |

X
- Definition Represents the term of an investment in held-to-maturity debt securities. + References No definition available. + Details
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Namespace Prefix: | bkyi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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: | num: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 investment in debt security measured at amortized cost (held-to-maturity), classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26626-111562 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant