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Note 5 - Factoring (Details Textual)	1 Months Ended
	Apr. 30, 2012	Dec. 31, 2011
Factoring Arrangement Term	2 years	24 years
Minimum [Member]
Factoring Fees Percent		2.75%
Maximum [Member]
Factoring Fees Percent		21.00%
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

The term of the factoring arrangement.

+ References

No definition available.

+ Details

Name:	bkyi_FactoringArrangementTerm
Namespace Prefix:	bkyi_
Data Type:	xbrli:durationItemType
Balance Type:	na
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:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_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: