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Note 6 - Factoring (Details Textual)	9 Months Ended
	Sep. 30, 2019 USD ($)
Factoring Arrangement, Minimum Amount of Accounts Receivable Per Quarter	$ 150,000
Minimum [Member]
Factoring Fees Percent	2.75%
Maximum [Member]
Factoring Fees Percent	15.00%
Geographic Distribution, Foreign [Member]
Percentage Of Accounts Receivable Remitted By Factor	35.00%
Geographic Distribution, Domestic [Member]
Percentage Of Accounts Receivable Remitted By Factor	75.00%

X

- Definition

Minimum amount of certain accounts receivable balances which must be sold to the Factor pursuant to the factoring arrangement.

+ References

No definition available.

+ Details

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

X

- Definition

Factoring fees percent.

+ References

No definition available.

+ Details

Name:	bkyi_FactoringFeesPercent
Namespace Prefix:	bkyi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of accounts receivable remitted by factor.

+ References

No definition available.

+ Details

Name:	bkyi_PercentageOfAccountsReceivableRemittedByFactor
Namespace Prefix:	bkyi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GeographicDistributionAxis=us-gaap_GeographicDistributionForeignMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GeographicDistributionAxis=us-gaap_GeographicDistributionDomesticMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: