<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.19.3.a.u2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>409</ContextCount>
  <ElementCount>382</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>82</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Current Period Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Unaudited Condensed Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-unaudited-condensed-consolidated-statements-of-operations</Role>
      <ShortName>Unaudited Condensed Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Unaudited Condensed Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-unaudited-condensed-consolidated-statements-of-comprehensive-income</Role>
      <ShortName>Unaudited Condensed Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-consolidated-statements-of-stockholders-equity</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Statement - Consolidated Statements of Stockholders' Equity (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-consolidated-statements-of-stockholders-equity-parentheticals</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Statement - Unaudited Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-unaudited-condensed-consolidated-statements-of-cash-flows</Role>
      <ShortName>Unaudited Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 1 - Management Statement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-1-management-statement</Role>
      <ShortName>Note 1 - Management Statement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 2 - Acquisitions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-2-acquisitions</Role>
      <ShortName>Note 2 - Acquisitions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 3 - Revenue From Contracts With Customers</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-3-revenue-from-contracts-with-customers</Role>
      <ShortName>Note 3 - Revenue From Contracts With Customers</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 4 - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-4-fair-value-measurements</Role>
      <ShortName>Note 4 - Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 5 - Discontinued Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-5-discontinued-operations</Role>
      <ShortName>Note 5 - Discontinued Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 6 - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-6-inventories</Role>
      <ShortName>Note 6 - Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 7 - Goodwill</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-7-goodwill</Role>
      <ShortName>Note 7 - Goodwill</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 8 - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-8-intangible-assets</Role>
      <ShortName>Note 8 - Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 9 - Warranties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-9-warranties</Role>
      <ShortName>Note 9 - Warranties</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 10 - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-10-debt</Role>
      <ShortName>Note 10 - Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 11 - Derivative Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments</Role>
      <ShortName>Note 11 - Derivative Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 12 - Retirement Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-12-retirement-benefits</Role>
      <ShortName>Note 12 - Retirement Benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 13 - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-13-income-taxes</Role>
      <ShortName>Note 13 - Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Note 14 - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-14-earnings-per-share</Role>
      <ShortName>Note 14 - Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Note 15 - Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-15-comprehensive-income-loss</Role>
      <ShortName>Note 15 - Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>023 - Disclosure - Note 16 - Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-16-contingencies</Role>
      <ShortName>Note 16 - Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>024 - Disclosure - Note 17 - Industry Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-17-industry-segment-information</Role>
      <ShortName>Note 17 - Industry Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>025 - Disclosure - Note 18 - Restructuring</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-18-restructuring</Role>
      <ShortName>Note 18 - Restructuring</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>026 - Disclosure - Note 19 - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-19-leases</Role>
      <ShortName>Note 19 - Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>027 - Disclosure - Note 2 - Acquisitions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-2-acquisitions-tables</Role>
      <ShortName>Note 2 - Acquisitions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-2-acquisitions</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>028 - Disclosure - Note 3 - Revenue From Contracts With Customers (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-3-revenue-from-contracts-with-customers-tables</Role>
      <ShortName>Note 3 - Revenue From Contracts With Customers (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-3-revenue-from-contracts-with-customers</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>029 - Disclosure - Note 4 - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-4-fair-value-measurements-tables</Role>
      <ShortName>Note 4 - Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-4-fair-value-measurements</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>030 - Disclosure - Note 5 - Discontinued Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-5-discontinued-operations-tables</Role>
      <ShortName>Note 5 - Discontinued Operations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-5-discontinued-operations</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>031 - Disclosure - Note 6 - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-6-inventories-tables</Role>
      <ShortName>Note 6 - Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-6-inventories</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>032 - Disclosure - Note 7 - Goodwill (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-7-goodwill-tables</Role>
      <ShortName>Note 7 - Goodwill (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-7-goodwill</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>033 - Disclosure - Note 8 - Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-8-intangible-assets-tables</Role>
      <ShortName>Note 8 - Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-8-intangible-assets</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>034 - Disclosure - Note 9 - Warranties (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-9-warranties-tables</Role>
      <ShortName>Note 9 - Warranties (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-9-warranties</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>035 - Disclosure - Note 10 - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-10-debt-tables</Role>
      <ShortName>Note 10 - Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-10-debt</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>036 - Disclosure - Note 11 - Derivative Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments-tables</Role>
      <ShortName>Note 11 - Derivative Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>037 - Disclosure - Note 12 - Retirement Benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-12-retirement-benefits-tables</Role>
      <ShortName>Note 12 - Retirement Benefits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-12-retirement-benefits</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>038 - Disclosure - Note 14 - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-14-earnings-per-share-tables</Role>
      <ShortName>Note 14 - Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-14-earnings-per-share</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>039 - Disclosure - Note 15 - Comprehensive Income (Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-15-comprehensive-income-loss-tables</Role>
      <ShortName>Note 15 - Comprehensive Income (Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-15-comprehensive-income-loss</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040 - Disclosure - Note 17 - Industry Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-17-industry-segment-information-tables</Role>
      <ShortName>Note 17 - Industry Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-17-industry-segment-information</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>041 - Disclosure - Note 18 - Restructuring (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-18-restructuring-tables</Role>
      <ShortName>Note 18 - Restructuring (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-18-restructuring</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>042 - Disclosure - Note 19 - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-19-leases-tables</Role>
      <ShortName>Note 19 - Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-19-leases</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>043 - Disclosure - Note 2 - Acquisitions (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-2-acquisitions-details-textual</Role>
      <ShortName>Note 2 - Acquisitions (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-2-acquisitions-tables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>044 - Disclosure - Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of GS Engineering (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-2-acquisitions-components-of-fair-value-of-acquisitions-and-allocation-of-purchase-price-for-acquisition-of-gs-engineering-details</Role>
      <ShortName>Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of GS Engineering (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>045 - Disclosure - Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of Agile Magnetics (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-2-acquisitions-components-of-fair-value-of-acquisitions-and-allocation-of-purchase-price-for-acquisition-of-agile-magnetics-details</Role>
      <ShortName>Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of Agile Magnetics (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>046 - Disclosure - Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of Tennibac-Graphion Inc. (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-2-acquisitions-components-of-fair-value-of-acquisitions-and-allocation-of-purchase-price-for-acquisition-of-tennibacgraphion-inc-details</Role>
      <ShortName>Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of Tennibac-Graphion Inc. (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>047 - Disclosure - Note 2 - Acquisitions - Components of Acquisition Related Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-2-acquisitions-components-of-acquisition-related-costs-details</Role>
      <ShortName>Note 2 - Acquisitions - Components of Acquisition Related Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>048 - Disclosure - Note 3 - Revenue From Contracts With Customers - Revenue Disaggregated (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-3-revenue-from-contracts-with-customers-revenue-disaggregated-details</Role>
      <ShortName>Note 3 - Revenue From Contracts With Customers - Revenue Disaggregated (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>049 - Disclosure - Note 3 - Revenue From Contracts With Customers - Contract Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-3-revenue-from-contracts-with-customers-contract-assets-and-liabilities-details</Role>
      <ShortName>Note 3 - Revenue From Contracts With Customers - Contract Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>050 - Disclosure - Note 4 - Fair Value Measurements - Fair Values of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-4-fair-value-measurements-fair-values-of-financial-instruments-details</Role>
      <ShortName>Note 4 - Fair Value Measurements - Fair Values of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>051 - Disclosure - Note 5 - Discontinued Operations (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-5-discontinued-operations-details-textual</Role>
      <ShortName>Note 5 - Discontinued Operations (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-5-discontinued-operations-tables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>052 - Disclosure - Note 5 - Discontinued Operations - Earnings (Losses) and Assets and Liabilities From Discontinued Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-5-discontinued-operations-earnings-losses-and-assets-and-liabilities-from-discontinued-operations-details</Role>
      <ShortName>Note 5 - Discontinued Operations - Earnings (Losses) and Assets and Liabilities From Discontinued Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>053 - Disclosure - Note 6 - Inventories (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-6-inventories-details-textual</Role>
      <ShortName>Note 6 - Inventories (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-6-inventories-tables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>054 - Disclosure - Note 6 - Inventories - Summary of Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-6-inventories-summary-of-inventories-details</Role>
      <ShortName>Note 6 - Inventories - Summary of Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>055 - Disclosure - Note 7 - Goodwill - Changes to Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-7-goodwill-changes-to-goodwill-details</Role>
      <ShortName>Note 7 - Goodwill - Changes to Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>056 - Disclosure - Note 8 - Intangible Assets (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-8-intangible-assets-details-textual</Role>
      <ShortName>Note 8 - Intangible Assets (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-8-intangible-assets-tables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>057 - Disclosure - Note 8 - Intangible Assets - Summary of Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-8-intangible-assets-summary-of-intangible-assets-details</Role>
      <ShortName>Note 8 - Intangible Assets - Summary of Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>058 - Disclosure - Note 9 - Warranties - Changes in Warranty Reserve (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-9-warranties-changes-in-warranty-reserve-details</Role>
      <ShortName>Note 9 - Warranties - Changes in Warranty Reserve (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>059 - Disclosure - Note 10 - Debt (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-10-debt-details-textual</Role>
      <ShortName>Note 10 - Debt (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-10-debt-tables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>060 - Disclosure - Note 10 - Debt - Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-10-debt-longterm-debt-details</Role>
      <ShortName>Note 10 - Debt - Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>061 - Disclosure - Note 10 - Debt - Maturities of Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-10-debt-maturities-of-longterm-debt-details</Role>
      <ShortName>Note 10 - Debt - Maturities of Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>062 - Disclosure - Note 11 - Derivative Financial Instruments (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments-details-textual</Role>
      <ShortName>Note 11 - Derivative Financial Instruments (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments-tables</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>063 - Disclosure - Note 11 - Derivative Financial Instruments - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments-fair-value-of-swaps-recognized-in-accrued-liabilities-and-in-other-comprehensive-income-details</Role>
      <ShortName>Note 11 - Derivative Financial Instruments - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>064 - Disclosure - Note 11 - Derivative Financial Instruments - Foreign Currency Exchange Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments-foreign-currency-exchange-contracts-details</Role>
      <ShortName>Note 11 - Derivative Financial Instruments - Foreign Currency Exchange Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>065 - Disclosure - Note 11 - Derivative Financial Instruments - Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) to Net Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments-amounts-reclassified-from-accumulated-other-comprehensive-income-loss-to-net-income-details</Role>
      <ShortName>Note 11 - Derivative Financial Instruments - Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) to Net Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>066 - Disclosure - Note 11 - Derivative Financial Instruments - Gain (Loss) Recognized in Comprehensive Income on Derivative Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments-gain-loss-recognized-in-comprehensive-income-on-derivative-financial-instruments-details</Role>
      <ShortName>Note 11 - Derivative Financial Instruments - Gain (Loss) Recognized in Comprehensive Income on Derivative Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments-tables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>067 - Disclosure - Note 11 - Derivative Financial Instruments - Details About Accumulated Other Comprehensive Income (Loss) Components (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-11-derivative-financial-instruments-details-about-accumulated-other-comprehensive-income-loss-components-details</Role>
      <ShortName>Note 11 - Derivative Financial Instruments - Details About Accumulated Other Comprehensive Income (Loss) Components (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>068 - Disclosure - Note 12 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-12-retirement-benefits-components-of-net-periodic-benefit-cost-details</Role>
      <ShortName>Note 12 - Retirement Benefits - Components of Net Periodic Benefit Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>069 - Disclosure - Note 12 - Retirement Benefits - Contributions to Defined Benefit Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-12-retirement-benefits-contributions-to-defined-benefit-plans-details</Role>
      <ShortName>Note 12 - Retirement Benefits - Contributions to Defined Benefit Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>070 - Disclosure - Note 13 - Income Taxes (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-13-income-taxes-details-textual</Role>
      <ShortName>Note 13 - Income Taxes (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-13-income-taxes</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>071 - Disclosure - Note 14 - Earnings Per Share (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-14-earnings-per-share-details-textual</Role>
      <ShortName>Note 14 - Earnings Per Share (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-14-earnings-per-share-tables</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>072 - Disclosure - Note 14 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-14-earnings-per-share-computation-of-basic-and-diluted-earnings-per-share-details</Role>
      <ShortName>Note 14 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>073 - Disclosure - Note 15 - Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-15-comprehensive-income-loss-components-of-accumulated-other-comprehensive-income-loss-details</Role>
      <ShortName>Note 15 - Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-15-comprehensive-income-loss-tables</ParentRole>
      <Position>74</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>074 - Disclosure - Note 17 - Industry Segment Information (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-17-industry-segment-information-details-textual</Role>
      <ShortName>Note 17 - Industry Segment Information (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-17-industry-segment-information-tables</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>075 - Disclosure - Note 17 - Industry Segment Information - Net Sales and Income (Loss) by Industry Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-17-industry-segment-information-net-sales-and-income-loss-by-industry-segments-details</Role>
      <ShortName>Note 17 - Industry Segment Information - Net Sales and Income (Loss) by Industry Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>076 - Disclosure - Note 17 - Industry Segment Information - Assets by Industry Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-17-industry-segment-information-assets-by-industry-segments-details</Role>
      <ShortName>Note 17 - Industry Segment Information - Assets by Industry Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>077 - Disclosure - Note 18 - Restructuring (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-18-restructuring-details-textual</Role>
      <ShortName>Note 18 - Restructuring (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.standex.com/20191231/role/statement-note-18-restructuring-tables</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>078 - Disclosure - Note 18 - Restructuring - Summary of Severance, Restructuring, and Related Charges by Initiative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-18-restructuring-summary-of-severance-restructuring-and-related-charges-by-initiative-details</Role>
      <ShortName>Note 18 - Restructuring - Summary of Severance, Restructuring, and Related Charges by Initiative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>079 - Disclosure - Note 18 - Restructuring - Summary of Activity in Reserves Related to Restructuring Initiatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-18-restructuring-summary-of-activity-in-reserves-related-to-restructuring-initiatives-details</Role>
      <ShortName>Note 18 - Restructuring - Summary of Activity in Reserves Related to Restructuring Initiatives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>080 - Disclosure - Note 18 - Restructuring - Summary of Restructuring Expenses by Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-18-restructuring-summary-of-restructuring-expenses-by-segment-details</Role>
      <ShortName>Note 18 - Restructuring - Summary of Restructuring Expenses by Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>081 - Disclosure - Note 19 - Leases - Amounts Recorded in Balance Sheet and Statement of Operations Related to Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-19-leases-amounts-recorded-in-balance-sheet-and-statement-of-operations-related-to-leases-details</Role>
      <ShortName>Note 19 - Leases - Amounts Recorded in Balance Sheet and Statement of Operations Related to Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>082 - Disclosure - Note 19 - Leases - Lease Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-19-leases-lease-cost-details</Role>
      <ShortName>Note 19 - Leases - Lease Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>083 - Disclosure - Note 19 - Leases - Maturity of Lease Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-19-leases-maturity-of-lease-liability-details</Role>
      <ShortName>Note 19 - Leases - Maturity of Lease Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="sxi20191231_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>084 - Disclosure - Note 19 - Leases - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.standex.com/20191231/role/statement-note-19-leases-additional-information-details</Role>
      <ShortName>Note 19 - Leases - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" original="sxi20191231_10q.htm">sxi20191231_10q.htm</File>
    <File>ex_171150.htm</File>
    <File>ex_171151.htm</File>
    <File>ex_171152.htm</File>
    <File>sxi-20191231.xsd</File>
    <File>sxi-20191231_cal.xml</File>
    <File>sxi-20191231_def.xml</File>
    <File>sxi-20191231_lab.xml</File>
    <File>sxi-20191231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2017-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
