<?xml version="1.0" encoding="utf-8"?>
<xbrl
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  xmlns:ffd="http://xbrl.sec.gov/ffd/2026"
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    <context id="rc">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001307579</identifier>
        </entity>
        <period>
            <startDate>2026-05-26</startDate>
            <endDate>2026-05-26</endDate>
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    <context id="offrl_1">
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            <identifier scheme="http://www.sec.gov/CIK">0001307579</identifier>
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        <period>
            <startDate>2026-05-26</startDate>
            <endDate>2026-05-26</endDate>
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    <context id="offrl_2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001307579</identifier>
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                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>2</dei:lineNo>
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        <period>
            <startDate>2026-05-26</startDate>
            <endDate>2026-05-26</endDate>
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    <context id="offrl_3">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001307579</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>3</dei:lineNo>
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        <period>
            <startDate>2026-05-26</startDate>
            <endDate>2026-05-26</endDate>
        </period>
    </context>
    <context id="offrl_4">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001307579</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>4</dei:lineNo>
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        <period>
            <startDate>2026-05-26</startDate>
            <endDate>2026-05-26</endDate>
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    <context id="offrl_5">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001307579</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>5</dei:lineNo>
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        <period>
            <startDate>2026-05-26</startDate>
            <endDate>2026-05-26</endDate>
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    <unit id="USD">
        <measure>iso4217:USD</measure>
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    <unit id="pure">
        <measure>pure</measure>
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    <ffd:FormTp contextRef="rc" id="ixv-428">S-1</ffd:FormTp>
    <ffd:SubmissnTp contextRef="rc" id="ixv-429">S-1</ffd:SubmissnTp>
    <ffd:FeeExhibitTp contextRef="rc" id="ixv-430">EX-FILING FEES</ffd:FeeExhibitTp>
    <dei:EntityCentralIndexKey contextRef="rc" id="ixv-431">0001307579</dei:EntityCentralIndexKey>
    <dei:EntityRegistrantName contextRef="rc" id="ixv-432">LIQTECH INTERNATIONAL INC</dei:EntityRegistrantName>
    <ffd:OfferingTableNa contextRef="rc" id="hiddenrcOfferingTableNa" xsi:nil="true"/>
    <ffd:OffsetTableNa contextRef="rc" id="hiddenrcOffsetTableNa">N/A</ffd:OffsetTableNa>
    <ffd:CombinedProspectusTableNa contextRef="rc" id="hiddenrcCombinedProspectusTableNa">N/A</ffd:CombinedProspectusTableNa>
    <ffd:FormTp contextRef="rc" id="ixv-496">S-1</ffd:FormTp>
    <dei:EntityRegistrantName contextRef="rc" id="ixv-497">LIQTECH INTERNATIONAL INC</dei:EntityRegistrantName>
    <ffd:PrevslyPdFlg contextRef="offrl_1" id="ixv-498">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_1" id="ixv-499">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_1" id="ixv-500">Common stock</ffd:OfferingSctyTitl>
    <ffd:Rule457oFlg contextRef="offrl_1" id="ixv-501">true</ffd:Rule457oFlg>
    <ffd:MaxAggtOfferingPric
      contextRef="offrl_1"
      decimals="2"
      id="ixv-502"
      unitRef="USD">23000000.00</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="offrl_1"
      decimals="7"
      id="ixv-503"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_1"
      decimals="2"
      id="ixv-504"
      unitRef="USD">3176.30</ffd:FeeAmt>
    <ffd:PrevslyPdFlg contextRef="offrl_2" id="ixv-505">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_2" id="ixv-506">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_2" id="ixv-507">Pre-Funded Warrants</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_2" id="ixv-508">true</ffd:FeesOthrRuleFlg>
    <ffd:FeeRate
      contextRef="offrl_2"
      decimals="7"
      id="ixv-509"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_2"
      decimals="2"
      id="ixv-510"
      unitRef="USD">0.00</ffd:FeeAmt>
    <ffd:PrevslyPdFlg contextRef="offrl_3" id="ixv-511">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_3" id="ixv-512">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_3" id="ixv-513">Common stock underlying Pre-Funded Warrants</ffd:OfferingSctyTitl>
    <ffd:Rule457oFlg contextRef="offrl_3" id="ixv-514">true</ffd:Rule457oFlg>
    <ffd:MaxAggtOfferingPric
      contextRef="offrl_3"
      decimals="2"
      id="ixv-515"
      unitRef="USD">0.00</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="offrl_3"
      decimals="7"
      id="ixv-516"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_3"
      decimals="2"
      id="ixv-517"
      unitRef="USD">0.00</ffd:FeeAmt>
    <ffd:PrevslyPdFlg contextRef="offrl_4" id="ixv-518">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_4" id="ixv-519">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_4" id="ixv-520">Warrants to be issued to the underwriter</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_4" id="ixv-521">true</ffd:FeesOthrRuleFlg>
    <ffd:FeeRate
      contextRef="offrl_4"
      decimals="7"
      id="ixv-522"
      unitRef="pure">0.0001381</ffd:FeeRate>
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      contextRef="offrl_4"
      decimals="2"
      id="ixv-523"
      unitRef="USD">0.00</ffd:FeeAmt>
    <ffd:PrevslyPdFlg contextRef="offrl_5" id="ixv-524">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_5" id="ixv-525">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_5" id="ixv-526">Common stock underlying warrants to be issued to the underwriter </ffd:OfferingSctyTitl>
    <ffd:Rule457oFlg contextRef="offrl_5" id="ixv-527">true</ffd:Rule457oFlg>
    <ffd:MaxAggtOfferingPric
      contextRef="offrl_5"
      decimals="2"
      id="ixv-528"
      unitRef="USD">1150000.00</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="offrl_5"
      decimals="7"
      id="ixv-529"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_5"
      decimals="2"
      id="ixv-530"
      unitRef="USD">158.81</ffd:FeeAmt>
    <ffd:TtlOfferingAmt contextRef="rc" decimals="2" id="ixv-531" unitRef="USD">24150000.00</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt contextRef="rc" decimals="2" id="ixv-532" unitRef="USD">3335.11</ffd:TtlFeeAmt>
    <ffd:TtlPrevslyPdAmt contextRef="rc" decimals="2" id="ixv-533" unitRef="USD">0.00</ffd:TtlPrevslyPdAmt>
    <ffd:TtlOffsetAmt contextRef="rc" decimals="2" id="ixv-534" unitRef="USD">0.00</ffd:TtlOffsetAmt>
    <ffd:NetFeeAmt contextRef="rc" decimals="2" id="ixv-535" unitRef="USD">3335.11</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="offrl_1" id="ixv-536">(a) In accordance with Rule 416 under the Securities Act of 1933, as amended (the "Securities Act"), this registration statement shall be deemed to cover an indeterminate number of additional shares of Common Stock to be offered or issued from stock splits, stock dividends or similar transactions. (b) The proposed maximum aggregate offering price has been estimated solely to calculate the registration fee in accordance with Rule 457(o) under the Securities Act. (c) Includes the price of additional shares of common stock that may be issued upon exercise of the over-allotment option granted to the underwriters to cover over-allotments, if any. (d) The proposed maximum aggregate offering price of the common stock will be reduced on a dollar-for-dollar basis based on the offering price of any pre-funded warrants issued in the offering, and the proposed maximum aggregate offering price of the pre-funded warrants to be issued in the offering will be reduced on a dollar-for-dollar basis based on the offering price of any common stock issued in the offering. Accordingly, the proposed maximum aggregate offering price of the common stock and pre-funded warrants (including the common stock issuable upon exercise of the pre-funded warrants), if any, is $23,000,000.</ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_2" id="ixv-537">Included above

(a) In accordance with Rule 416 under the Securities Act, this registration statement shall be deemed to cover an indeterminate number of additional shares of Common Stock to be offered or issued from stock splits, stock dividends or similar transactions. (b) The proposed maximum aggregate offering price has been estimated solely to calculate the registration fee in accordance with Rule 457(o) under the Securities Act. (c) Includes the price of additional shares of common stock that may be issued upon exercise of the over-allotment option granted to the underwriters to cover over-allotments, if any. (d) The proposed maximum aggregate offering price of the common stock will be reduced on a dollar-for-dollar basis based on the offering price of any pre-funded warrants issued in the offering, and the proposed maximum aggregate offering price of the pre-funded warrants to be issued in the offering will be reduced on a dollar-for-dollar basis based on the offering price of any common stock issued in the offering. Accordingly, the proposed maximum aggregate offering price of the common stock and pre-funded warrants (including the common stock issuable upon exercise of the pre-funded warrants), if any, is $23,000,000. (e) No registration fee required pursuant to Rule 457(g). </ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_3" id="ixv-538">included above

(a) In accordance with Rule 416 under the Securities Act, this registration statement shall be deemed to cover an indeterminate number of additional shares of Common Stock to be offered or issued from stock splits, stock dividends or similar transactions. (b) The proposed maximum aggregate offering price has been estimated solely to calculate the registration fee in accordance with Rule 457(o) under the Securities Act. (d) The proposed maximum aggregate offering price of the common stock will be reduced on a dollar-for-dollar basis based on the offering price of any pre-funded warrants issued in the offering, and the proposed maximum aggregate offering price of the pre-funded warrants to be issued in the offering will be reduced on a dollar-for-dollar basis based on the offering price of any common stock issued in the offering. Accordingly, the proposed maximum aggregate offering price of the common stock and pre-funded warrants (including the common stock issuable upon exercise of the pre-funded warrants), if any, is $23,000,000.</ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_4" id="ixv-539">(a) In accordance with Rule 416 under the Securities Act, this registration statement shall be deemed to cover an indeterminate number of additional shares of Common Stock to be offered or issued from stock splits, stock dividends or similar transactions. (b) The proposed maximum aggregate offering price has been estimated solely to calculate the registration fee in accordance with Rule 457(o) under the Securities Act. (c) No registration fee required pursuant to Rule 457(g).</ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_5" id="ixv-540">(a) In accordance with Rule 416 under the Securities Act, this registration statement shall be deemed to cover an indeterminate number of additional shares of Common Stock to be offered or issued from stock splits, stock dividends or similar transactions. (b) The proposed maximum aggregate offering price has been estimated solely to calculate the registration fee in accordance with Rule 457(o) under the Securities Act. (d) We have agreed to issue to the underwriter the underwriters warrants to purchase shares of common stock representing up to 4% of the common stock issued in the offering. The underwriter's warrants are exercisable at a per share exercise price equal to 125% of the public offering price per share of the common stock offered hereby. </ffd:OfferingNote>
</xbrl>
