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v3.20.1

Note M - Deferred Revenue (Details Textual) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Maintenance Contracts [Member] |  |
Deferred Revenue, Current, Total | $ 359,000 | $ 197,000

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredRevenueCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=bkyi_MaintenanceContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |