<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>244</ContextCount>
  <ElementCount>306</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>58</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report instance="clfd20260630_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.clearfieldconnection.com/20260630/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="clfd20260630_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.clearfieldconnection.com/20260630/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="clfd20260630_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.clearfieldconnection.com/20260630/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="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Condensed Consolidated Statements of Earnings (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-condensed-consolidated-statements-of-earnings-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Earnings (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-condensed-consolidated-statements-of-comprehensive-income-loss-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Condensed Consolidated Statements of Shareholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-condensed-consolidated-statements-of-shareholders-equity-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Shareholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Note 1 - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-1-summary-of-significant-accounting-policies</Role>
      <ShortName>Note 1 - Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 2 - Net Income (Loss) Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-2-net-income-loss-per-share</Role>
      <ShortName>Note 2 - Net Income (Loss) Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 3 - Cash and Cash Equivalents</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-3-cash-and-cash-equivalents</Role>
      <ShortName>Note 3 - Cash and Cash Equivalents</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 4 - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-4-investments</Role>
      <ShortName>Note 4 - Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 5 - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-5-fair-value-measurements</Role>
      <ShortName>Note 5 - Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 6 - Other Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-6-other-comprehensive-income-loss</Role>
      <ShortName>Note 6 - Other Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 7 - Stock-based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-7-stockbased-compensation</Role>
      <ShortName>Note 7 - Stock-based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 8 - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-8-revenue</Role>
      <ShortName>Note 8 - Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 9 - Major Customer Concentration</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-9-major-customer-concentration</Role>
      <ShortName>Note 9 - Major Customer Concentration</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 10 - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-10-inventories</Role>
      <ShortName>Note 10 - Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 11 - Goodwill and Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-11-goodwill-and-intangible-assets</Role>
      <ShortName>Note 11 - Goodwill and Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 12 - Segment Reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-12-segment-reporting</Role>
      <ShortName>Note 12 - Segment Reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 13 - Assets Held for Sale and Discontinued Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-13-assets-held-for-sale-and-discontinued-operations</Role>
      <ShortName>Note 13 - Assets Held for Sale and Discontinued Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 14 - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-14-income-taxes</Role>
      <ShortName>Note 14 - Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Note 15 - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-15-leases</Role>
      <ShortName>Note 15 - Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Note 16 - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-16-debt-</Role>
      <ShortName>Note 16 - Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-significant-accounting-policies-policies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-1-summary-of-significant-accounting-policies</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995446 - Disclosure - Note 2 - Net Income (Loss) Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-2-net-income-loss-per-share-tables</Role>
      <ShortName>Note 2 - Net Income (Loss) Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-2-net-income-loss-per-share</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Note 3 - Cash and Cash Equivalents (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-3-cash-and-cash-equivalents-tables</Role>
      <ShortName>Note 3 - Cash and Cash Equivalents (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-3-cash-and-cash-equivalents</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995448 - Disclosure - Note 4 - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-4-investments-tables</Role>
      <ShortName>Note 4 - Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-4-investments</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995449 - Disclosure - Note 5 - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-5-fair-value-measurements-tables</Role>
      <ShortName>Note 5 - Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-5-fair-value-measurements</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995450 - Disclosure - Note 6 - Other Comprehensive Income (Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-6-other-comprehensive-income-loss-tables</Role>
      <ShortName>Note 6 - Other Comprehensive Income (Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-6-other-comprehensive-income-loss</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995451 - Disclosure - Note 7 - Stock-based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-7-stockbased-compensation-tables</Role>
      <ShortName>Note 7 - Stock-based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-7-stockbased-compensation</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995452 - Disclosure - Note 8 - Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-8-revenue-tables</Role>
      <ShortName>Note 8 - Revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-8-revenue</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995453 - Disclosure - Note 10 - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-10-inventories-tables</Role>
      <ShortName>Note 10 - Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-10-inventories</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995454 - Disclosure - Note 11 - Goodwill and Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-11-goodwill-and-intangible-assets-tables</Role>
      <ShortName>Note 11 - Goodwill and Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-11-goodwill-and-intangible-assets</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995455 - Disclosure - Note 13 - Assets Held for Sale and Discontinued Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-13-assets-held-for-sale-and-discontinued-operations-tables</Role>
      <ShortName>Note 13 - Assets Held for Sale and Discontinued Operations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-13-assets-held-for-sale-and-discontinued-operations</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995456 - Disclosure - Note 15 - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-15-leases-tables</Role>
      <ShortName>Note 15 - Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-15-leases</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995457 - Disclosure - Note 2 - Net Income (Loss) Per Share (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-2-net-income-loss-per-share-details-textual</Role>
      <ShortName>Note 2 - Net Income (Loss) Per Share (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-2-net-income-loss-per-share-tables</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995458 - Disclosure - Note 2 - Net Income (Loss) Per Share - Weighted Average Common Shares Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-2-net-income-loss-per-share-weighted-average-common-shares-outstanding-details</Role>
      <ShortName>Note 2 - Net Income (Loss) Per Share - Weighted Average Common Shares Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-2-net-income-loss-per-share-tables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995459 - Disclosure - Note 3 - Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-3-cash-and-cash-equivalents-schedule-of-cash-and-cash-equivalents-details</Role>
      <ShortName>Note 3 - Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995460 - Disclosure - Note 4 - Investments (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-4-investments-details-textual</Role>
      <ShortName>Note 4 - Investments (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-4-investments-tables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995461 - Disclosure - Note 4 - Investments - Available-for-sale Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-4-investments-availableforsale-investments-details</Role>
      <ShortName>Note 4 - Investments - Available-for-sale Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995462 - Disclosure - Note 4 - Investments - Securities in a Continuous Unrealized Loss Position (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-4-investments-securities-in-a-continuous-unrealized-loss-position-details</Role>
      <ShortName>Note 4 - Investments - Securities in a Continuous Unrealized Loss Position (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995463 - Disclosure - Note 5 - Fair Value Measurements (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-5-fair-value-measurements-details-textual</Role>
      <ShortName>Note 5 - Fair Value Measurements (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-5-fair-value-measurements-tables</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995464 - Disclosure - Note 5 - Fair Value Measurements - Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-5-fair-value-measurements-fair-value-measurements-details</Role>
      <ShortName>Note 5 - Fair Value Measurements - Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995465 - Disclosure - Note 6 - Other Comprehensive Income (Loss) - Changes in Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-6-other-comprehensive-income-loss-changes-in-other-comprehensive-income-loss-details</Role>
      <ShortName>Note 6 - Other Comprehensive Income (Loss) - Changes in Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-6-other-comprehensive-income-loss-tables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995466 - Disclosure - Note 7 - Stock-based Compensation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-7-stockbased-compensation-details-textual</Role>
      <ShortName>Note 7 - Stock-based Compensation (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-7-stockbased-compensation-tables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995467 - Disclosure - Note 7 - Stock-based Compensation - Option Transaction Summary (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-7-stockbased-compensation-option-transaction-summary-details</Role>
      <ShortName>Note 7 - Stock-based Compensation - Option Transaction Summary (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995468 - Disclosure - Note 7 - Stock-based Compensation - Restricted Stock Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-7-stockbased-compensation-restricted-stock-transactions-details</Role>
      <ShortName>Note 7 - Stock-based Compensation - Restricted Stock Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995469 - Disclosure - Note 7 - Stock-Based Compensation - Performance Stock Performance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-7-stockbased-compensation-performance-stock-performance-details</Role>
      <ShortName>Note 7 - Stock-Based Compensation - Performance Stock Performance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995470 - Disclosure - Note 8 - Revenue (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-8-revenue-details-textual</Role>
      <ShortName>Note 8 - Revenue (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-8-revenue-tables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995471 - Disclosure - Note 8 - Revenue - Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-8-revenue-disaggregation-of-revenue-details</Role>
      <ShortName>Note 8 - Revenue - Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995472 - Disclosure - Note 9 - Major Customer Concentration (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-9-major-customer-concentration-details-textual</Role>
      <ShortName>Note 9 - Major Customer Concentration (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-9-major-customer-concentration</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995473 - Disclosure - Note 10 - Inventories - Components of Inventory (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-10-inventories-components-of-inventory-details</Role>
      <ShortName>Note 10 - Inventories - Components of Inventory (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995474 - Disclosure - Note 11 - Goodwill and Intangible Assets (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-11-goodwill-and-intangible-assets-details-textual</Role>
      <ShortName>Note 11 - Goodwill and Intangible Assets (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-11-goodwill-and-intangible-assets-tables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Note 11 - Goodwill and Intangibles - Finite Lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-11-goodwill-and-intangibles-finite-lived-intangible-assets-details</Role>
      <ShortName>Note 11 - Goodwill and Intangibles - Finite Lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995476 - Disclosure - Note 11 - Goodwill and Intangibles - Future Estimated Amortization Expense for Intangibles (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-11-goodwill-and-intangibles-future-estimated-amortization-expense-for-intangibles-details</Role>
      <ShortName>Note 11 - Goodwill and Intangibles - Future Estimated Amortization Expense for Intangibles (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995477 - Disclosure - Note 12 - Segment Reporting (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-12-segment-reporting-details-textual</Role>
      <ShortName>Note 12 - Segment Reporting (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-12-segment-reporting</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995478 - Disclosure - Note 13 - Assets Held for Sale and Discontinued Operations (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-13-assets-held-for-sale-and-discontinued-operations-details-textual</Role>
      <ShortName>Note 13 - Assets Held for Sale and Discontinued Operations (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-13-assets-held-for-sale-and-discontinued-operations-tables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>995479 - Disclosure - Note 13 - Assets Held for Sale and Discontinued Operations - Discontinued Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-13-assets-held-for-sale-and-discontinued-operations-discontinued-operations-details</Role>
      <ShortName>Note 13 - Assets Held for Sale and Discontinued Operations - Discontinued Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>995480 - Disclosure - Note 14 - Income Taxes (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-14-income-taxes-details-textual</Role>
      <ShortName>Note 14 - Income Taxes (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-14-income-taxes</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>995481 - Disclosure - Note 15 - Leases (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-15-leases-details-textual</Role>
      <ShortName>Note 15 - Leases (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-15-leases-tables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>995482 - Disclosure - Note 15 - Leases - Operating Lease Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-15-leases-operating-lease-expense-details</Role>
      <ShortName>Note 15 - Leases - Operating Lease Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>995483 - Disclosure - Note 15 - Leases - Maturities of Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-15-leases-maturities-of-lease-liabilities-details</Role>
      <ShortName>Note 15 - Leases - Maturities of Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="clfd20260630_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>995484 - Disclosure - Note 16 - Debt (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.clearfieldconnection.com/20260630/role/statement-note-16-debt-details-textual</Role>
      <ShortName>Note 16 - Debt (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.clearfieldconnection.com/20260630/role/statement-note-16-debt-</ParentRole>
      <Position>64</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>clfd-20260630.xsd</File>
    <File>clfd-20260630_cal.xml</File>
    <File>clfd-20260630_def.xml</File>
    <File>clfd-20260630_lab.xml</File>
    <File>clfd-20260630_pre.xml</File>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="clfd20260630_10q.htm">clfd20260630_10q.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="955">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
