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Note 4 - Accounts Receivable (Details Textual) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable, Noncurrent	$ 1,000,000	$ 1,000,000
Percentage of Remaining Balance Owned Reserved	58.00%

X

- Definition

The percentage of remaining balance owned under the contract that has been reserved.

+ References

No definition available.

+ Details

Name:	bkyi_PercentageOfRemainingBalanceOwnedReserved
Namespace Prefix:	bkyi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

A valuation allowance for receivables due to an Entity for more than one year from the balance sheet date that are expected to be uncollectible.

+ 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(4))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

Reference 3: 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(17))
-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:	credit
Period Type:	instant