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Note 15 - Subsequent Events (Details Textual) - USD ($)							3 Months Ended
	May 14, 2018	May 10, 2018	Apr. 03, 2018	Mar. 23, 2018	Oct. 17, 2017	Sep. 22, 2017	Mar. 31, 2018	Mar. 31, 2017
Conversion of Dividends Payable, Shares Issued				115,857		150,000
Conversion of Dividends Payable, Amount Converted				$ 417,084		$ 540,000	$ 417,084
Shares Issued, Price Per Share						$ 3.60
Subsequent Event [Member]
Conversion of Dividends Payable, Shares Issued			91,820
Conversion of Dividends Payable, Amount Converted			$ 330,552
Shares Issued, Price Per Share			$ 3.60
Stock Issued During Period, Shares, Issued for Services	648	2,035
Conversion of Series A-1 Shares into Common Stock [Member]
Conversion of Stock, Shares Converted					27,404
Conversion of Stock, Shares Issued					761,222
Conversion of Series A-1 Shares into Common Stock [Member] | Subsequent Event [Member]
Conversion of Stock, Shares Converted			39,088
Conversion of Stock, Shares Issued			1,085,778

X

- Definition

The value of the dividends payable that are converted in a noncash (or part noncash) transaction.

+ References

No definition available.

+ Details

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

X

- Definition

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction.

+ References

No definition available.

+ Details

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Namespace Prefix:	bkyi_
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X

- Definition

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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X

- Definition

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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X

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

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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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- Details

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- Details

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