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Note 8 - Resalable Software Licenses Rights (Details Textual) - USD ($)			3 Months Ended		27 Months Ended
	Dec. 31, 2015	Nov. 11, 2015	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Software License Rights, Current			$ 2,730,000		$ 2,730,000	$ 2,730,000	$ 2,640,000
Amortization of Intangible Assets, Total			5,655	$ 3,402
Software License Rights			9,926,348		9,926,348	9,926,348	10,573,808
Software License Rights, Noncurrent			$ 7,196,348		7,196,348	7,196,348	$ 7,933,808
Licensing Agreements [Member]
Payments to Acquire Intangible Assets		$ 12,000,000
Finite-Lived Intangible Asset, Useful Life			10 years
Amortization of Intangible Assets, Total			$ 660,000	388,092		2,218,596
Software License Rights			9,781,404		9,781,404	9,781,404
Software License Rights [Member]
Amortization of Intangible Assets, Total			(12,540)	$ 6,696	35,056
Payments to Acquire Software	$ 180,000
Software License Rights, Noncurrent			$ 144,944		$ 144,944	$ 144,944

X

- Definition

Represents the amount of current and noncurrent software license rights as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amounts as of the balance sheet date of software license rights classified as current.

+ References

No definition available.

+ Details

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Namespace Prefix:	bkyi_
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X

- Definition

Carrying amounts as of the balance sheet date of software license rights classified as non-current.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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X

- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition from vendors of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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