<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>123</ContextCount>
  <ElementCount>212</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>19</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="gic20260930_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.globalindustrial.com/20260930/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="gic20260930_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.globalindustrial.com/20260930/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="gic20260930_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.globalindustrial.com/20260930/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="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-condensed-consolidated-statements-of-operations-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Operations (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-condensed-consolidated-statements-of-comprehensive-income-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Statement - Condensed Consolidated Statement of Shareholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-condensed-consolidated-statement-of-shareholders-equity-unaudited</Role>
      <ShortName>Condensed Consolidated Statement of Shareholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Note 1 - Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-1-basis-of-presentation</Role>
      <ShortName>Note 1 - Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 2 - Acquisition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-2-acquisition</Role>
      <ShortName>Note 2 - Acquisition</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 3 - Goodwill and Intangibles</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-3-goodwill-and-intangibles</Role>
      <ShortName>Note 3 - Goodwill and Intangibles</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 4 - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-4-revenue</Role>
      <ShortName>Note 4 - Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 5 - Credit Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-5-credit-losses</Role>
      <ShortName>Note 5 - Credit Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 6 - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-6-leases</Role>
      <ShortName>Note 6 - Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 7 - Net Income (Loss) per Common Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-7-net-income-loss-per-common-share</Role>
      <ShortName>Note 7 - Net Income (Loss) per Common Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 8 - Credit Facilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-8-credit-facilities</Role>
      <ShortName>Note 8 - Credit Facilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 9 - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-9-fair-value-measurements</Role>
      <ShortName>Note 9 - Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 10 - Segment Reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-10-segment-reporting</Role>
      <ShortName>Note 10 - Segment Reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 11 - Legal Proceedings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-11-legal-proceedings</Role>
      <ShortName>Note 11 - Legal Proceedings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 12 - Purchases of Equity Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-12-purchases-of-equity-securities</Role>
      <ShortName>Note 12 - Purchases of Equity Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.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>20</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995465 - Disclosure - Note 3 - Goodwill and Intangibles (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-3-goodwill-and-intangibles-tables</Role>
      <ShortName>Note 3 - Goodwill and Intangibles (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-3-goodwill-and-intangibles</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995466 - Disclosure - Note 4 - Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-4-revenue-tables</Role>
      <ShortName>Note 4 - Revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-4-revenue</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995467 - Disclosure - Note 5 - Credit Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-5-credit-losses-tables</Role>
      <ShortName>Note 5 - Credit Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-5-credit-losses</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995468 - Disclosure - Note 6 - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-6-leases-tables</Role>
      <ShortName>Note 6 - Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-6-leases</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995469 - Disclosure - Note 7 - Net Income (Loss) per Common Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-7-net-income-loss-per-common-share-tables</Role>
      <ShortName>Note 7 - Net Income (Loss) per Common Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-7-net-income-loss-per-common-share</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995470 - Disclosure - Note 10 - Segment Reporting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-10-segment-reporting-tables</Role>
      <ShortName>Note 10 - Segment Reporting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-10-segment-reporting</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995471 - Disclosure - Note 1 - Basis of Presentation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-1-basis-of-presentation-details-textual</Role>
      <ShortName>Note 1 - Basis of Presentation (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-1-basis-of-presentation</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995472 - Disclosure - Note 2 - Acquisition (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-2-acquisition-details-textual</Role>
      <ShortName>Note 2 - Acquisition (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-2-acquisition</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995473 - Disclosure - Note 3 - Goodwill and Intangibles (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-3-goodwill-and-intangibles-details-textual</Role>
      <ShortName>Note 3 - Goodwill and Intangibles (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-3-goodwill-and-intangibles-tables</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995474 - Disclosure - Note 3 - Goodwill and Intangibles - Schedule of Goodwill and Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-3-goodwill-and-intangibles-schedule-of-goodwill-and-intangible-assets-details</Role>
      <ShortName>Note 3 - Goodwill and Intangibles - Schedule of Goodwill and Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Note 3 - Goodwill and Intangibles - Schedule of Definite-lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-3-goodwill-and-intangibles-schedule-of-definitelived-intangible-assets-details</Role>
      <ShortName>Note 3 - Goodwill and Intangibles - Schedule of Definite-lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995476 - Disclosure - Note 3 - Goodwill and Intangibles - Future Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-3-goodwill-and-intangibles-future-amortization-expense-details</Role>
      <ShortName>Note 3 - Goodwill and Intangibles - Future Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995477 - Disclosure - Note 4 - Revenue (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-4-revenue-details-textual</Role>
      <ShortName>Note 4 - Revenue (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-4-revenue-tables</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995478 - Disclosure - Note 4 - Revenue - Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-4-revenue-disaggregation-of-revenue-details</Role>
      <ShortName>Note 4 - Revenue - Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995479 - Disclosure - Note 5 - Credit Losses - Schedule of Allowance for Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-5-credit-losses-schedule-of-allowance-for-credit-losses-details</Role>
      <ShortName>Note 5 - Credit Losses - Schedule of Allowance for Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995480 - Disclosure - Note 6 - Leases (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-6-leases-details-textual</Role>
      <ShortName>Note 6 - Leases (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-6-leases-tables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995481 - Disclosure - Note 6 - Leases - Lease Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-6-leases-lease-information-details</Role>
      <ShortName>Note 6 - Leases - Lease Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995482 - Disclosure - Note 6 - Leases - Maturities of Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-6-leases-maturities-of-lease-liabilities-details</Role>
      <ShortName>Note 6 - Leases - Maturities of Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995483 - Disclosure - Note 7 - Net Income (Loss) per Common Share - Schedule of Net Income (Loss) per Common Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-7-net-income-loss-per-common-share-schedule-of-net-income-loss-per-common-share-details</Role>
      <ShortName>Note 7 - Net Income (Loss) per Common Share - Schedule of Net Income (Loss) per Common Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-7-net-income-loss-per-common-share-tables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995484 - Disclosure - Note 8 - Credit Facilities (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-8-credit-facilities-details-textual</Role>
      <ShortName>Note 8 - Credit Facilities (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-8-credit-facilities</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995485 - Disclosure - Note 9 - Fair Value Measurements (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-9-fair-value-measurements-details-textual</Role>
      <ShortName>Note 9 - Fair Value Measurements (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-9-fair-value-measurements</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995486 - Disclosure - Note 10 - Segment Reporting (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-10-segment-reporting-details-textual</Role>
      <ShortName>Note 10 - Segment Reporting (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-10-segment-reporting-tables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995487 - Disclosure - Note 10 - Segment Reporting - Schedule of Segment Reporting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-10-segment-reporting-schedule-of-segment-reporting-details</Role>
      <ShortName>Note 10 - Segment Reporting - Schedule of Segment Reporting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="gic20260930_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995488 - Disclosure - Note 12 - Purchases of Equity Securities (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.globalindustrial.com/20260930/role/statement-note-12-purchases-of-equity-securities-details-textual</Role>
      <ShortName>Note 12 - Purchases of Equity Securities (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.globalindustrial.com/20260930/role/statement-note-12-purchases-of-equity-securities</ParentRole>
      <Position>44</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>gic-20260930.xsd</File>
    <File>gic-20260930_cal.xml</File>
    <File>gic-20260930_def.xml</File>
    <File>gic-20260930_lab.xml</File>
    <File>gic-20260930_pre.xml</File>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="gic20260930_10q.htm">gic20260930_10q.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2026</BaseTaxonomy>
    <BaseTaxonomy items="810">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>
