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Note 15 - Major Customers and Accounts Receivables (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue Benchmark [Member]
Concentration Risk, Number of Major Customers	2	2
Concentration Risk, Percentage	56.00%	48.00%
Current Accounts Receivable [Member]
Concentration Risk, Number of Major Customers	1		1
Concentration Risk, Percentage	74.00%		70.00%
Non-current Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Number of Major Customers	1		1
Concentration Risk, Percentage	100.00%		100.00%
Percentage Of Accounts Receivable Reserved	100.00%		100.00%

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

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

X

- Definition

The percentage of reserved accounts receivable.

+ References

No definition available.

+ Details

Name:	bkyi_PercentageOfAccountsReceivableReserved
Namespace Prefix:	bkyi_
Data Type:	num:percentItemType
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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=bkyi_CurrentAccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=bkyi_NonCurrentAccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: