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Note 11 - Major Customers and Accounts Receivable (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Sales Revenue, Net [Member] | Two Customers [Member]
Concentration Risk, Percentage	44.00%
Sales Revenue, Net [Member] | Three Customers Member
Concentration Risk, Percentage		65.00%
Sales Revenue, Net [Member] | One Customer [Member]
Concentration Risk, Percentage			22.00%
Sales Revenue, Net [Member]
Concentration Risk, Number of Major Customers	2	3	1
Accounts Receivable [Member] | Three Customers Member
Concentration Risk, Percentage					87.00%
Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage			85.00%	53.00%
Accounts Receivable, Period Past Due			1 year 90 days
Accounts Receivable [Member]
Concentration Risk, Number of Major Customers			1	1	3

X

- Definition

The time period the accounts receivables have been past due per the terms of the invoice.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of external customers that accounts for 10 percent or more of an entity's revenues or accounts receivable.

+ References

No definition available.

+ Details

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

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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