v3.26.1
Schedule of Assets - Schedule of Assets (Held at End of Year) (Details) - EBP 004 [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2025
USD ($)
shares
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Plan Name Capital Accumulation Plan
Entity Tax Identification Number 77-0664171
EBP, Plan Number 004
Current Value $ 3,103,722
Total Investments $ 233,134,975
EBP, Investment, Number of Shares | shares 3,197,065
Investment, Identifier [Axis]: Common Stock Hecla Mining Co. 3,197,065 shares of common stock  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 60,881,955
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Common Stock [Member]
EBP, Asset Held for Investment, Party-in-Interest [true false] true
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Stock [Member]
Investment, Identifier [Axis]: Money Market Vanguard Federal Money Market  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 6,293,444
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Money Market Funds [Member]
Investment, Identifier [Axis]: Mutual Funds American Funds Growth Fund of America; R-4 Class  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 8,990,726
EBP, Investment, Issuer Name [Extensible Enumeration] American [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Artisan International Fund, Investor Class  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 2,037,994
EBP, Investment, Issuer Name [Extensible Enumeration] Artisan [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard 500 Index Fund Investor Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 12,498,154
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Growth and Income Fund Investor Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 6,630,092
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Small-Cap Value Index Fund Admiral  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 1,811,322
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Strategic Equity Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 4,315,295
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2020 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 2,337,176
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2025 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 11,453,285
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2030 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 16,601,265
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2035 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 22,020,694
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2040 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 15,143,244
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2045 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 17,200,338
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2050 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 16,434,067
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2055 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 7,124,390
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2060 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 4,450,036
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2065 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 2,155,516
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement 2070 Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 1,223,820
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Mutual Fund [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Mutual Funds Vanguard Target Retirement Income  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 1,890,911
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Total Bond Market Index Fund Investor Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 1,624,529
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Total International Bond Index Fund Investor Shr  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 600,835
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Total Stock Market Index Fund Admiral Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 4,476,988
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Mutual Funds Vanguard Windsor II Fund Investor Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 1,835,177
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Fund [Member]
Investment, Identifier [Axis]: Participant Loans Participant loans Interest rates ranging from 4.25% to 9.50%  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Participant Loans [Member]
EBP, Asset Held for Investment, Party-in-Interest [true false] true
EBP, Investment, Current Value, Type [Extensible Enumeration] Participant Loans [Member]
Investment, Identifier [Axis]: Total Mutual Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 162,855,854
Maximum [Member]  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Asset Held for Investment, Participant Loan, Interest Rate 9.50%
Minimum [Member]  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Asset Held for Investment, Participant Loan, Interest Rate 4.25%