<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>256</ContextCount>
  <ElementCount>383</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>82</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>12</UnitCount>
  <MyReports>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>75000 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>75010 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/StatementCondensedConsolidatedStatementsOfOperationsAndComprehensiveIncomeUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>75030 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>75040 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets1</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>75050 - Statement - Condensed Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsParentheticals</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>75060 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/StatementCondensedConsolidatedStatementsOfChangesInStockholdersEquityUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>75070 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/StatementCondensedConsolidatedStatementsOfChangesInStockholdersEquityUnauditedParentheticals</Role>
      <ShortName>Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.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>9</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995455 - Disclosure - Note 1 - Basis of Preparation of Financial Statements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/Note1BasisOfPreparationOfFinancialStatements</Role>
      <ShortName>Note 1 - Basis of Preparation of Financial Statements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995465 - Disclosure - Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote2SaleOfHeclaQuebecIncAndDiscontinuedOperations1</Role>
      <ShortName>Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Note 3 - Business Segments and Sales of Products</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote3BusinessSegmentsAndSalesOfProducts</Role>
      <ShortName>Note 3 - Business Segments and Sales of Products</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995485 - Disclosure - Note 4 - Income and Mining Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote4IncomeAndMiningTaxes</Role>
      <ShortName>Note 4 - Income and Mining Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995495 - Disclosure - Note 5 - Employee Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote5EmployeeBenefitPlans1</Role>
      <ShortName>Note 5 - Employee Benefit Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995505 - Disclosure - Note 6 - Earnings (Loss) Per Common Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote6EarningsLossPerCommonShare</Role>
      <ShortName>Note 6 - Earnings (Loss) Per Common Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995515 - Disclosure - Note 7 - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote7StockholdersEquity1</Role>
      <ShortName>Note 7 - Stockholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995525 - Disclosure - Note 8 - Debt, Credit Agreement and Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote8DebtCreditAgreementAndLeases4</Role>
      <ShortName>Note 8 - Debt, Credit Agreement and Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995535 - Disclosure - Note 9 - Derivative Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote9DerivativeInstruments1</Role>
      <ShortName>Note 9 - Derivative Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995545 - Disclosure - Note 10 - Fair Value Measurement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote10FairValueMeasurement1</Role>
      <ShortName>Note 10 - Fair Value Measurement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995555 - Disclosure - Note 11 - Product Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote11ProductInventories1</Role>
      <ShortName>Note 11 - Product Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995565 - Disclosure - Note 12 - Commitments, Contingencies and Obligations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote12CommitmentsContingenciesAndObligations1</Role>
      <ShortName>Note 12 - Commitments, Contingencies and Obligations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995575 - Disclosure - Note 13 - Recent Accounting Pronouncements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote13RecentAccountingPronouncements</Role>
      <ShortName>Note 13 - Recent Accounting Pronouncements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995585 - Disclosure - Note 14 - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote14SubsequentEvents1</Role>
      <ShortName>Note 14 - Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995595 - Disclosure - Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote2SaleOfHeclaQuebecIncAndDiscontinuedOperationsTables</Role>
      <ShortName>Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote2SaleOfHeclaQuebecIncAndDiscontinuedOperations1</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995605 - Disclosure - Note 3- Business Segments and Sales of Products (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote3BusinessSegmentsAndSalesOfProductsTables</Role>
      <ShortName>Note 3- Business Segments and Sales of Products (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995615 - Disclosure - Note 4 - Income and Mining Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote4IncomeAndMiningTaxesTables</Role>
      <ShortName>Note 4 - Income and Mining Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote4IncomeAndMiningTaxes</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995625 - Disclosure - Note 5 - Employee Benefit Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote5EmployeeBenefitPlansTables</Role>
      <ShortName>Note 5 - Employee Benefit Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote5EmployeeBenefitPlans1</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995635 - Disclosure - Note 6 - Earnings (Loss) Per Common Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote6EarningsLossPerCommonShareTables</Role>
      <ShortName>Note 6 - Earnings (Loss) Per Common Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote6EarningsLossPerCommonShare</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995645 - Disclosure - Note 7 - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote7StockholdersEquityTables</Role>
      <ShortName>Note 7 - Stockholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote7StockholdersEquity1</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995655 - Disclosure - Note 8 - Debt, Credit Agreement and Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote8DebtCreditAgreementAndLeasesTables</Role>
      <ShortName>Note 8 - Debt, Credit Agreement and Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote8DebtCreditAgreementAndLeases4</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995665 - Disclosure - Note 9 - Derivative Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote9DerivativeInstrumentsTables</Role>
      <ShortName>Note 9 - Derivative Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote9DerivativeInstruments1</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995675 - Disclosure - Note 10 - Fair Value Measurement (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote10FairValueMeasurementTables</Role>
      <ShortName>Note 10 - Fair Value Measurement (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote10FairValueMeasurement1</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995685 - Disclosure - Note 11. Product Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote11ProductInventoriesTables</Role>
      <ShortName>Note 11. Product Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995705 - Disclosure - Note 1 - Basis of Preparation of Financial Statements (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote1BasisOfPreparationOfFinancialStatementsAdditionalInformationDetails</Role>
      <ShortName>Note 1 - Basis of Preparation of Financial Statements (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/Note1BasisOfPreparationOfFinancialStatements</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995715 - Disclosure - Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote2SaleOfHeclaQuebecIncAndDiscontinuedOperationsAdditionalInformationDetails</Role>
      <ShortName>Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote2SaleOfHeclaQuebecIncAndDiscontinuedOperationsTables</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995725 - Disclosure - Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations - Statement of Discountinued Operation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote2SaleOfHeclaQuebecIncAndDiscontinuedOperationsStatementOfDiscountinuedOperationDetails</Role>
      <ShortName>Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations - Statement of Discountinued Operation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995735 - Disclosure - Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations - Reconciliation of Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote2SaleOfHeclaQuebecIncAndDiscontinuedOperationsReconciliationOfAssetsAndLiabilitiesDetails</Role>
      <ShortName>Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations - Reconciliation of Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995745 - Disclosure - Note 3 - Business Segments and Sales of Products (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote3BusinessSegmentsAndSalesOfProductsDetailsTextual</Role>
      <ShortName>Note 3 - Business Segments and Sales of Products (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote3BusinessSegmentsAndSalesOfProducts</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995755 - Disclosure - Note 3 - Business Segments and Sales of Products - Information About Reportable Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote3BusinessSegmentsAndSalesOfProductsInformationAboutReportableSegmentsDetails</Role>
      <ShortName>Note 3 - Business Segments and Sales of Products - Information About Reportable Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995775 - Disclosure - Note 3 - Business Segments and Sales of Products - Sales of Products (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote3BusinessSegmentsAndSalesOfProductsSalesOfProductsDetails</Role>
      <ShortName>Note 3 - Business Segments and Sales of Products - Sales of Products (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995785 - Disclosure - Note 4 - Income and Mining Taxes - Major Components of Income Tax Provision (Benefit) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote4IncomeAndMiningTaxesMajorComponentsOfIncomeTaxProvisionBenefitDetails</Role>
      <ShortName>Note 4 - Income and Mining Taxes - Major Components of Income Tax Provision (Benefit) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995805 - Disclosure - Note 5 - Employee Benefit Plans (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote5EmployeeBenefitPlansDetailsTextual</Role>
      <ShortName>Note 5 - Employee Benefit Plans (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote5EmployeeBenefitPlansTables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995815 - Disclosure - Note 5 - Employee Benefit Plans - Net Periodic Pension Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote5EmployeeBenefitPlansNetPeriodicPensionCostDetails</Role>
      <ShortName>Note 5 - Employee Benefit Plans - Net Periodic Pension Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995825 - Disclosure - Note 6 - Earnings (Loss) Per Common Share - Net Income Per Common Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote6EarningsLossPerCommonShareNetIncomePerCommonShareDetails</Role>
      <ShortName>Note 6 - Earnings (Loss) Per Common Share - Net Income Per Common Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote6EarningsLossPerCommonShareTables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995835 - Disclosure - Note 7 - Stockholders' Equity (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote7StockholdersEquityDetailsTextual</Role>
      <ShortName>Note 7 - Stockholders' Equity (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote7StockholdersEquityTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995855 - Disclosure - Note 7 - Stockholders' Equity - Schedule of Accumulated other comprehensive income (loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote7StockholdersEquityScheduleOfAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>Note 7 - Stockholders' Equity - Schedule of Accumulated other comprehensive income (loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995865 - Disclosure - Note 8 - Debt, Credit Agreement and Leases (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote8DebtCreditAgreementAndLeasesDetailsTextual</Role>
      <ShortName>Note 8 - Debt, Credit Agreement and Leases (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote8DebtCreditAgreementAndLeasesTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995875 - Disclosure - Note 8 - Debt, Credit Agreement and Leases - Debt Summary (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote8DebtCreditAgreementAndLeasesDebtSummaryDetails</Role>
      <ShortName>Note 8 - Debt, Credit Agreement and Leases - Debt Summary (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995885 - Disclosure - Note 8 - Debt, Credit Agreement and Leases - Future Payments of Long-term Debt and Finance and Operating Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote8DebtCreditAgreementAndLeasesFuturePaymentsOfLongtermDebtAndFinanceAndOperatingLeasesDetails</Role>
      <ShortName>Note 8 - Debt, Credit Agreement and Leases - Future Payments of Long-term Debt and Finance and Operating Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995915 - Disclosure - Note 9 - Derivative Instruments (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote9DerivativeInstrumentsDetailsTextual</Role>
      <ShortName>Note 9 - Derivative Instruments (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote9DerivativeInstrumentsTables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995925 - Disclosure - Note 9 - Derivative Instruments - Foreign Currency (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote9DerivativeInstrumentsForeignCurrencyDetails</Role>
      <ShortName>Note 9 - Derivative Instruments - Foreign Currency (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995935 - Disclosure - Note 9 - Derivative Instruments - Summary of Forward Sales Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote9DerivativeInstrumentsSummaryOfForwardSalesContractsDetails</Role>
      <ShortName>Note 9 - Derivative Instruments - Summary of Forward Sales Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995945 - Disclosure - Note 9 - Derivative Instruments - Summarize the Quantities of Metals Committed (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote9DerivativeInstrumentsSummarizeTheQuantitiesOfMetalsCommittedDetails</Role>
      <ShortName>Note 9 - Derivative Instruments - Summarize the Quantities of Metals Committed (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995955 - Disclosure - Note 9 - Derivative Instruments - Fair Value of Forward and Put Option Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote9DerivativeInstrumentsFairValueOfForwardAndPutOptionContractsDetails</Role>
      <ShortName>Note 9 - Derivative Instruments - Fair Value of Forward and Put Option Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995965 - Disclosure - Note 9 - Derivative Instruments - Summary of collar positions to provide price protection on Keno Hill's forecasted silver production (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote9DerivativeInstrumentsSummaryOfCollarPositionsToProvidePriceProtectionOnKenoHillsForecastedSilverProductionDetails</Role>
      <ShortName>Note 9 - Derivative Instruments - Summary of collar positions to provide price protection on Keno Hill's forecasted silver production (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995975 - Disclosure - Note 10 - Fair Value Measurement (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote10FairValueMeasurementDetailsTextual</Role>
      <ShortName>Note 10 - Fair Value Measurement (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote10FairValueMeasurementTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995985 - Disclosure - Note 10 - Fair Value Measurement - Details of Fair Value Adjustment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote10FairValueMeasurementDetailsOfFairValueAdjustmentDetails</Role>
      <ShortName>Note 10 - Fair Value Measurement - Details of Fair Value Adjustment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995995 - Disclosure - Note 10 - Fair Value Measurement - Assets and Liabilities Accounted for at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote10FairValueMeasurementAssetsAndLiabilitiesAccountedForAtFairValueDetails</Role>
      <ShortName>Note 10 - Fair Value Measurement - Assets and Liabilities Accounted for at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>996005 - Disclosure - Note 11 - Product Inventories - Schedule of Our Major Components of Product Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote11ProductInventoriesScheduleOfOurMajorComponentsOfProductInventoriesDetails</Role>
      <ShortName>Note 11 - Product Inventories - Schedule of Our Major Components of Product Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996015 - Disclosure - Note 12 - Commitments, Contingencies and Obligations (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote12CommitmentsContingenciesAndObligationsDetailsTextual</Role>
      <ShortName>Note 12 - Commitments, Contingencies and Obligations (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote12CommitmentsContingenciesAndObligations1</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="hl-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996025 - Disclosure - Note 14- Subsequent Events (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hecla-mining.com/20260331/taxonomy/role/DisclosureNote14SubsequentEventsAdditionalInformationDetails</Role>
      <ShortName>Note 14- Subsequent Events (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="hl-20260331.htm">hl-20260331.htm</File>
    <File>hl-20260331.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img234753599_0.gif</File>
    <File>img234753599_1.gif</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="808">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="32">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
