<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-08-21</periodOfReport>

    <issuer>
        <issuerCik>0000310354</issuerCik>
        <issuerName>STANDEX INTERNATIONAL CORP/DE/</issuerName>
        <issuerTradingSymbol>SXI</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001239849</rptOwnerCik>
            <rptOwnerName>GLASS ALAN J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>23 KEEWAYDIN DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>SALEM</rptOwnerCity>
            <rptOwnerState>NH</rptOwnerState>
            <rptOwnerZipCode>03079</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>CLO, VP &amp; Secretary</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

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                <value>Common Stock</value>
            </securityTitle>
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            </transactionDate>
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                <footnoteId id="F1"/>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
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    </nonDerivativeTable>

    <derivativeTable>
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                <transactionAcquiredDisposedCode>
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            </transactionAmounts>
            <exerciseDate>
                <value>2026-08-23</value>
            </exerciseDate>
            <expirationDate>
                <value>2026-08-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
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                </underlyingSecurityShares>
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            <expirationDate>
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            </expirationDate>
            <underlyingSecurity>
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            <expirationDate>
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            </expirationDate>
            <underlyingSecurity>
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                    <footnoteId id="F4"/>
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                </underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
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                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        <derivativeTransaction>
            <securityTitle>
                <value>Phantom Stock Units</value>
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            <conversionOrExercisePrice>
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            <transactionDate>
                <value>2026-08-23</value>
            </transactionDate>
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                <transactionCode>A</transactionCode>
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                <footnoteId id="F6"/>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>524</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F6"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2029-08-23</value>
            </exerciseDate>
            <expirationDate>
                <value>2029-08-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>524</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>524</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
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                    <value>D</value>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Vesting of Phantom Stock pursuant to Company's Management Stock Purchase Plan.</footnote>
        <footnote id="F2">Shares sold to pay taxes on vesting of previously issued restricted stock and/or performance share units.</footnote>
        <footnote id="F3">Vesting of Phantom Stock pursuant to the Company's 2018 Omnibus Incentive Plan. Actual achievement, which could have ranged from 0% to 250% of the award, was 68%. The transaction reported herein is the actual number of shares vesting pursuant thereto.</footnote>
        <footnote id="F4">Vesting of Restricted Stock Units pursuant to the Company's 2018 Omnibus Incentive Plan.</footnote>
        <footnote id="F5">Vesting of Phantom Stock pursuant to the Company's 2018 Omnibus Incentive Plan. Actual achievement, which could have ranged from 0% to 250% of the award, was 68%. Phantom Stock Units were granted at 100% achievement, so this transaction reflects the disposition of shares to accurately reflect the vesting.</footnote>
        <footnote id="F6">Contingent Purchase of Phantom Stock of the Company pursuant to the Management Stock Purchase Plan component of the 2018 Omnibus Incentive Plan vesting three years after the date of purchase in the form of Common Stock.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Kristine L. Ouimet</signatureName>
        <signatureDate>2026-08-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
