<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>303</ContextCount>
  <ElementCount>390</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>105</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-consolidated-balance-sheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100030 - Statement - Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-consolidated-balance-sheets-parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100040 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-consolidated-statements-of-operations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100050 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-consolidated-statements-of-cash-flows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100060 - Statement - Consolidated Statements of Stockholders' Equity (Defitcit)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-consolidated-statements-of-stockholders-equity-defitcit</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity (Defitcit)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100070 - Disclosure - Note 1 - Organization and Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-1-organization-and-business</Role>
      <ShortName>Note 1 - Organization and Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100080 - Disclosure - Note 2 - Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-2-basis-of-presentation</Role>
      <ShortName>Note 2 - Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100090 - Disclosure - Note 3 - Liquidity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-3-liquidity</Role>
      <ShortName>Note 3 - Liquidity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100100 - Disclosure - Note 4 - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-4-summary-of-significant-accounting-policies</Role>
      <ShortName>Note 4 - Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100110 - Disclosure - Note 5 - Prepaid Expenses and Other</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-5-prepaid-expenses-and-other</Role>
      <ShortName>Note 5 - Prepaid Expenses and Other</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100120 - Disclosure - Note 6 - Net Loss Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-6-net-loss-per-share</Role>
      <ShortName>Note 6 - Net Loss Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100130 - Disclosure - Note 7 - Stockholders' Equity (Deficit)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-7-stockholders-equity-deficit</Role>
      <ShortName>Note 7 - Stockholders' Equity (Deficit)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100140 - Disclosure - Note 8 - Acquisition of Lucky Shot Property</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote8AcquisitionOfLuckyShotProperty</Role>
      <ShortName>Note 8 - Acquisition of Lucky Shot Property</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100150 - Disclosure - Note 9 - Property &amp; Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-9-property-equipment</Role>
      <ShortName>Note 9 - Property &amp; Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100160 - Disclosure - Note 10 - Investment in Peak Gold, LLC</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote10InvestmentInPeakGoldLlc</Role>
      <ShortName>Note 10 - Investment in Peak Gold, LLC</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100170 - Disclosure - Note 11 - Stock Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-11-stock-based-compensation</Role>
      <ShortName>Note 11 - Stock Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100180 - Disclosure - Note 12 - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-12-commitments-and-contingencies</Role>
      <ShortName>Note 12 - Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100190 - Disclosure - Note 13 - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-13-income-taxes</Role>
      <ShortName>Note 13 - Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Note 14 - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-14-related-party-transactions</Role>
      <ShortName>Note 14 - Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100210 - Disclosure - Note 15 - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-15-debt</Role>
      <ShortName>Note 15 - Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100220 - Disclosure - Note 16 - Derivatives and Hedging Activities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote16DerivativesAndHedgingActivities</Role>
      <ShortName>Note 16 - Derivatives and Hedging Activities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100230 - Disclosure - Note 17 - General and Administrative Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote17GeneralAndAdministrativeExpenses1</Role>
      <ShortName>Note 17 - General and Administrative Expenses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100250 - Disclosure - Note 18 - Transition Period Comparative Data</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote18TransitionPeriodComparativeData</Role>
      <ShortName>Note 18 - Transition Period Comparative Data</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100260 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-significant-accounting-policies-policies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-4-summary-of-significant-accounting-policies</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100270 - Disclosure - Note 4 - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote4SummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Note 4 - Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-4-summary-of-significant-accounting-policies</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100280 - Disclosure - Note 6 - Net Loss Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-6-net-loss-per-share-tables</Role>
      <ShortName>Note 6 - Net Loss Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-6-net-loss-per-share</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100290 - Disclosure - Note 9 - Property &amp; Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-9-property-equipment-tables</Role>
      <ShortName>Note 9 - Property &amp; Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-9-property-equipment</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100300 - Disclosure - Note 10 - Investment in Peak Gold, LLC (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote10InvestmentInPeakGoldLlcTables</Role>
      <ShortName>Note 10 - Investment in Peak Gold, LLC (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote10InvestmentInPeakGoldLlc</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100310 - Disclosure - Note 11 - Stock Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-11-stock-based-compensation-tables</Role>
      <ShortName>Note 11 - Stock Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-11-stock-based-compensation</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100320 - Disclosure - Note 13 - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-13-income-taxes-tables</Role>
      <ShortName>Note 13 - Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-13-income-taxes</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100330 - Disclosure - Note 15 - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-15-debt-tables</Role>
      <ShortName>Note 15 - Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-15-debt</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100340 - Disclosure - Note 16 - Derivatives and Hedging Activities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote16DerivativesAndHedgingActivitiesTables</Role>
      <ShortName>Note 16 - Derivatives and Hedging Activities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote16DerivativesAndHedgingActivities</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100350 - Disclosure - Note 17 - General and Administrative Expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote17GeneralAndAdministrativeExpensesTables</Role>
      <ShortName>Note 17 - General and Administrative Expenses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote17GeneralAndAdministrativeExpenses1</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100360 - Disclosure - Note 18 - Transition Period Comparative Data (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote18TransitionPeriodComparativeDataTables</Role>
      <ShortName>Note 18 - Transition Period Comparative Data (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote18TransitionPeriodComparativeData</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Note 1 - Organization and Business (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-1-organization-and-business-details-textual</Role>
      <ShortName>Note 1 - Organization and Business (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-1-organization-and-business</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100380 - Disclosure - Note 3 - Liquidity (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote3LiquidityDetailsTextual</Role>
      <ShortName>Note 3 - Liquidity (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-3-liquidity</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Note 4 - Summary of Significant Accounting Policies (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-4-summary-of-significant-accounting-policies-details-textual</Role>
      <ShortName>Note 4 - Summary of Significant Accounting Policies (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote4SummaryOfSignificantAccountingPoliciesTables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Note 4 - Summary of Significant Accounting Policies - Summary of Fair Value of Financial Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote4SummaryOfSignificantAccountingPoliciesSummaryOfFairValueOfFinancialAssetsAndLiabilitiesDetails</Role>
      <ShortName>Note 4 - Summary of Significant Accounting Policies - Summary of Fair Value of Financial Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Note 5 - Prepaid Expenses and Other (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-5-prepaid-expenses-and-other-details-textual</Role>
      <ShortName>Note 5 - Prepaid Expenses and Other (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-5-prepaid-expenses-and-other</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Note 6 - Net Loss Per Share (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-6-net-loss-per-share-details-textual</Role>
      <ShortName>Note 6 - Net Loss Per Share (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-6-net-loss-per-share-tables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Note 6 - Net Loss Per Share - Reconciliation of the Components of Basic and Diluted Net Loss Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-6-net-loss-per-share-reconciliation-of-the-components-of-basic-and-diluted-net-loss-per-share-details</Role>
      <ShortName>Note 6 - Net Loss Per Share - Reconciliation of the Components of Basic and Diluted Net Loss Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Note 7 - Stockholders' Equity (Deficit) (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote7StockholdersEquityDeficitDetailsTextual</Role>
      <ShortName>Note 7 - Stockholders' Equity (Deficit) (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-7-stockholders-equity-deficit</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Note 8 - Acquisition of Lucky Shot Property (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-8-acquisition-of-lucky-shot-property-details-textual</Role>
      <ShortName>Note 8 - Acquisition of Lucky Shot Property (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote8AcquisitionOfLuckyShotProperty</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Note 9 - Property &amp; Equipment - Fixed Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-9-property-equipment-fixed-assets-details</Role>
      <ShortName>Note 9 - Property &amp; Equipment - Fixed Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Note 10 - Investment in Peak Gold, LLC (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote10InvestmentInPeakGoldLlcDetailsTextual</Role>
      <ShortName>Note 10 - Investment in Peak Gold, LLC (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote10InvestmentInPeakGoldLlcTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Note 10 - Investment in Peak Gold JV - Roll-forward of Investment in the Joint Venture Company (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote10InvestmentInPeakGoldJvRollforwardOfInvestmentInTheJointVentureCompanyDetails</Role>
      <ShortName>Note 10 - Investment in Peak Gold JV - Roll-forward of Investment in the Joint Venture Company (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Note 10 - Investment in Peak Gold JV - Condensed Balance Sheet for Peak Gold, LLC (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote10InvestmentInPeakGoldJvCondensedBalanceSheetForPeakGoldLlcDetails</Role>
      <ShortName>Note 10 - Investment in Peak Gold JV - Condensed Balance Sheet for Peak Gold, LLC (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Note 10 - Investment in Peak Gold JV - Condensed Results of Operations for Peak Gold, LLC (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote10InvestmentInPeakGoldJvCondensedResultsOfOperationsForPeakGoldLlcDetails</Role>
      <ShortName>Note 10 - Investment in Peak Gold JV - Condensed Results of Operations for Peak Gold, LLC (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Note 11 - Stock Based Compensation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-11-stock-based-compensation-details-textual</Role>
      <ShortName>Note 11 - Stock Based Compensation (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-11-stock-based-compensation-tables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Note 11 - Stock Based Compensation - Summary of Stock Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-11-stock-based-compensation-summary-of-stock-options-details</Role>
      <ShortName>Note 11 - Stock Based Compensation - Summary of Stock Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Note 11 - Stock Based Compensation - Summary of Restricted Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-11-stock-based-compensation-summary-of-restricted-stock-details</Role>
      <ShortName>Note 11 - Stock Based Compensation - Summary of Restricted Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Note 12 - Commitments and Contingencies (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-12-commitments-and-contingencies-details-textual</Role>
      <ShortName>Note 12 - Commitments and Contingencies (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-12-commitments-and-contingencies</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Note 13 - Income Taxes (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-13-income-taxes-details-textual</Role>
      <ShortName>Note 13 - Income Taxes (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-13-income-taxes-tables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100560 - Disclosure - Note 13 - Income Taxes - Income Tax Provision Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-13-income-taxes-income-tax-provision-reconciliation-details</Role>
      <ShortName>Note 13 - Income Taxes - Income Tax Provision Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Note 13 - Income Taxes - Income Tax Provision Continuing Operation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-13-income-taxes-income-tax-provision-continuing-operation-details</Role>
      <ShortName>Note 13 - Income Taxes - Income Tax Provision Continuing Operation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Note 13 - Income Taxes - Deferred Tax Asset (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-13-income-taxes-deferred-tax-asset-details</Role>
      <ShortName>Note 13 - Income Taxes - Deferred Tax Asset (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100590 - Disclosure - Note 14 - Related Party Transactions (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-14-related-party-transactions-details-textual</Role>
      <ShortName>Note 14 - Related Party Transactions (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-14-related-party-transactions</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Note 15 - Debt - Components of Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-15-debt-components-of-debt-details</Role>
      <ShortName>Note 15 - Debt - Components of Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100610 - Disclosure - Note 15 - Debt (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/statement-note-15-debt-details-textual</Role>
      <ShortName>Note 15 - Debt (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/statement-note-15-debt-tables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100620 - Disclosure - Note 16 - Derivatives and Hedging Activities (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote16DerivativesAndHedgingActivitiesDetailsTextual</Role>
      <ShortName>Note 16 - Derivatives and Hedging Activities (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote16DerivativesAndHedgingActivitiesTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Note 16 - Derivatives and Hedging Activities - Derivatives Not Designated as Hedging (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote16DerivativesAndHedgingActivitiesDerivativesNotDesignatedAsHedgingDetails</Role>
      <ShortName>Note 16 - Derivatives and Hedging Activities - Derivatives Not Designated as Hedging (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>100640 - Disclosure - Note 16 - Derivatives and Hedging Activities - Fair Values of Derivative Instruments on the Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote16DerivativesAndHedgingActivitiesFairValuesOfDerivativeInstrumentsOnTheBalanceSheetDetails</Role>
      <ShortName>Note 16 - Derivatives and Hedging Activities - Fair Values of Derivative Instruments on the Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Note 16 - Derivatives and Hedging Activities - Effect on Income Statement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote16DerivativesAndHedgingActivitiesEffectOnIncomeStatementDetails</Role>
      <ShortName>Note 16 - Derivatives and Hedging Activities - Effect on Income Statement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>100660 - Disclosure - Note 17 - General and Administrative Expenses - Components of General and Administrative Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote17GeneralAndAdministrativeExpensesComponentsOfGeneralAndAdministrativeExpensesDetails</Role>
      <ShortName>Note 17 - General and Administrative Expenses - Components of General and Administrative Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>100670 - Disclosure - Note 18 - Transition Period Comparative Data - Statements of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote18TransitionPeriodComparativeDataStatementsOfOperationsDetails</Role>
      <ShortName>Note 18 - Transition Period Comparative Data - Statements of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ctgo-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>100680 - Disclosure - Note 18 - Transition Period Comparative Data - Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.contangoore.com/20231231/taxonomy/role/DisclosureNote18TransitionPeriodComparativeDataStatementsOfCashFlowsDetails</Role>
      <ShortName>Note 18 - Transition Period Comparative Data - Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</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-KT" isDefinitelyFs="true" isUsgaap="true" original="ctgo-20231231.htm">ctgo-20231231.htm</File>
    <File>ctgo-20231231.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img174838770_0.jpg</File>
    <File>img174838770_1.jpg</File>
    <File>img174838770_2.jpg</File>
    <File>img174838770_3.jpg</File>
    <File>img174838770_4.jpg</File>
    <File>img174838770_5.jpg</File>
    <File>img174838770_6.jpg</File>
    <File>img174838770_7.jpg</File>
    <File>img174838770_8.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1104">http://fasb.org/us-gaap/2023</BaseTaxonomy>
    <BaseTaxonomy items="40">http://xbrl.sec.gov/dei/2023</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
