<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2026"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="cik0002108359-20260827.xsd" xlink:type="simple"/>
    <context id="AsOf2026-08-27">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002108359</identifier>
        </entity>
        <period>
            <startDate>2026-08-27</startDate>
            <endDate>2026-08-27</endDate>
        </period>
    </context>
    <dei:AmendmentFlag contextRef="AsOf2026-08-27" id="Fact000003">true</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey contextRef="AsOf2026-08-27" id="Fact000004">0002108359</dei:EntityCentralIndexKey>
    <dei:DocumentType contextRef="AsOf2026-08-27" id="Fact000009">8-K/A</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="AsOf2026-08-27" id="Fact000010">2026-08-27</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName contextRef="AsOf2026-08-27" id="Fact000011">BIOKEY (CAYMAN), INC.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode contextRef="AsOf2026-08-27" id="Fact000012">E9</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber contextRef="AsOf2026-08-27" id="Fact000013">000-56853</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber contextRef="AsOf2026-08-27" id="Fact000014">93-3535498</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1 contextRef="AsOf2026-08-27" id="Fact000015">44370 Old Warm Springs Blvd.</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown contextRef="AsOf2026-08-27" id="Fact000016">Fremont</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince contextRef="AsOf2026-08-27" id="Fact000017">CA</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode contextRef="AsOf2026-08-27" id="Fact000018">94538</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode contextRef="AsOf2026-08-27" id="Fact000019">510</dei:CityAreaCode>
    <dei:LocalPhoneNumber contextRef="AsOf2026-08-27" id="Fact000020">668-0881</dei:LocalPhoneNumber>
    <dei:WrittenCommunications contextRef="AsOf2026-08-27" id="Fact000021">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial contextRef="AsOf2026-08-27" id="Fact000022">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer contextRef="AsOf2026-08-27" id="Fact000023">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer contextRef="AsOf2026-08-27" id="Fact000024">false</dei:PreCommencementIssuerTenderOffer>
    <dei:EntityEmergingGrowthCompany contextRef="AsOf2026-08-27" id="Fact000025">true</dei:EntityEmergingGrowthCompany>
    <dei:EntityExTransitionPeriod contextRef="AsOf2026-08-27" id="Fact000026">false</dei:EntityExTransitionPeriod>
    <dei:AmendmentDescription contextRef="AsOf2026-08-27" id="Fact000027">Earlier today, BioKey (Cayman), Inc., an exempted company incorporated
with limited liability under the laws of the Cayman Islands (the &#x201c;Company&#x201d;), filed a Current Report on Form 8-K (the
&#x201c;Initial 8K&#x201d;) to disclose that it has successfully completed the separation (the &#x201c;Spin-Off&#x201d;) from
ABVC BioPharma, Inc. (&#x201c;ABVC&#x201d;), effected by ABVC&#x2019;s distribution of approximately 15% of the issued and outstanding
ordinary shares, par value $0.0001 per share (&#x201c;Ordinary Shares&#x201d;), of the Company to holders of common stock of ABVC
(the &#x201c;ABVC Common Stockholders&#x201d;) as a pro rata dividend in the Spin-Off (the &#x201c;Distribution&#x201d;), pursuant
to the terms of that certain Separation and Distribution Agreement, dated as of June 22, 2026, between the Company and ABVC (the &#x201c;Separation
Agreement&#x201d;). Attached as Exhibit 99.1 to the Initial 8K, was the final form of the information statement that describes the
Spin-Off and provides important information regarding the Company&#x2019;s business and management (the &#x201c;Information Statement&#x201d;),
however it was not dated. We are filing this amendment to the Initial 8K solely to attach the final, dated Information Statement. Other
than the date, there are no changes to the Information Statement.</dei:AmendmentDescription>
</xbrl>
