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Note 16 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($)	May 14, 2019	Apr. 04, 2019
Proceeds from Convertible Debt		$ 550,000
Debt Instrument, Convertible, Conversion Price		$ 1.50
Debt Instrument, Discount Percent		7.00%
Number of Additional Debentures		2
Debt Instrument, Covenant, Additional Principle Amount		$ 550,000
Debt Instrument, Covenant, Principle Amount, Total Potential		$ 1,650,000
Stock Issued During Period, Shares, Payment of Commitment Fee		80,000
Debt Instrument, Fee Amount		$ 120,000
Common Stock, Shares, Issued, Per Month		10,000
Monthly Commitment Fee		$ 15,000
Stock Issued During Period, Shares, Issued for Services	4,235
Minimum [Member]
Debt Instrument, Redemption Price, Percentage		5.00%
Maximum [Member]
Debt Instrument, Redemption Price, Percentage		20.00%

X

- Definition

Amount of shares of common stock to be issued monthly.

+ References

No definition available.

+ Details

Name:	bkyi_CommonStockSharesIssuedPerMonth
Namespace Prefix:	bkyi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents additional principle amount of debt after 45 days intervals from prior issuance.

+ References

No definition available.

+ Details

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

X

- Definition

Represents total potential amount of debt principle including two additional principle debenture after 45 day intervals from prior issuance.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of discount at time of issue.

+ References

No definition available.

+ Details

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Namespace Prefix:	bkyi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of commitment fee per month.

+ References

No definition available.

+ Details

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

X

- Definition

Represents number of additional debentures.

+ References

No definition available.

+ Details

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Namespace Prefix:	bkyi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of shares issued during the period for payment of commitment fee.

+ References

No definition available.

+ Details

Name:	bkyi_StockIssuedDuringPeriodSharesPaymentOfCommitmentFee
Namespace Prefix:	bkyi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

+ References

No definition available.

+ Details

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Period Type:

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- Details

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