v3.26.1
Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations (Additional Information) (Details)
shares in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
$ / Ounces
shares
Mar. 31, 2026
XAG
$ / Ounces
Dec. 31, 2025
USD ($)
XAU
$ / oz
shares
Dec. 31, 2025
XAG
$ / oz
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Disposal Group, Including Discontinued Operations [Line Items]            
Consideration closing date Mar. 25, 2026 Mar. 25, 2026        
Disposal Group, Including Discontinued Operation, Accounts Receivable     $ 5,091,000   $ 6,431,000  
Common Stock Value $ 169,779,000   169,689,000   160,052,000  
Deferred cash consideration 11,500,000   57,100,000      
Contingent Consideration 35,900,000   35,900,000      
Cash to be received 215,534,000   170,230,000   $ 31,515,000 $ 19,400,000
Capital additions (excluding non-cash items)     190,900,000      
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax 2,400,000          
Closure plan cost 150,000,000   150,000,000      
Hecla Quebec Inc. [Member]            
Disposal Group, Including Discontinued Operations [Line Items]            
Consideration of Fair Value 385,700,000   385,700,000      
Disposal Group, Including Discontinued Operation, Cash 170,000,000   $ 170,000,000      
Consideration closing date     Mar. 25, 2026 Mar. 25, 2026    
Accounts receivable related to working capital adjustments 16,600,000   $ 16,600,000      
Disposal Group, Including Discontinued Operation, Accounts Receivable 15,600,000          
Accounts receivable related to working capital remaining $ 1,000,000          
Issuance of Common Share | shares 65,757,265   65,757,265      
Common Stock Value $ 106,100,000   $ 106,100,000      
Deferred cash consideration 57,100,000          
Cash 30,000,000   30,000,000      
Cash to be received 50,000,000   $ 50,000,000      
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax $ 192,500,000          
Gold [Member]            
Disposal Group, Including Discontinued Operations [Line Items]            
Average gold price 4,200   4,200      
Gold [Member] | Hecla Quebec Inc. [Member]            
Disposal Group, Including Discontinued Operations [Line Items]            
Asset Acquisition, Price of Acquisition, Expected $ 3,300,000   $ 3,300,000      
Capital additions (excluding non-cash items) 5,000,000   5,000      
Permit Receipt Payment [Member] | Hecla Quebec Inc. [Member]            
Disposal Group, Including Discontinued Operations [Line Items]            
Asset Acquisition, Price of Acquisition, Expected 10,000,000   10,000,000      
Contingent Consideration Payment Fair Value 9,900,000   9,900,000      
Production-Based Royalty Payments [Member]            
Disposal Group, Including Discontinued Operations [Line Items]            
Contingent Consideration 22,700,000 XAG 500,000 22,700,000 XAG 500,000    
Maximum [Member]            
Disposal Group, Including Discontinued Operations [Line Items]            
Contingent Consideration 241,000,000   241,000,000      
Maximum [Member] | Production-Based Royalty Payments [Member]            
Disposal Group, Including Discontinued Operations [Line Items]            
Contingent Consideration $ 211,000,000   $ 211,000,000      
Underlying, Derivative Mass 180 180 180 180    
Minimum [Member] | Production-Based Royalty Payments [Member]            
Disposal Group, Including Discontinued Operations [Line Items]            
Underlying, Derivative Mass 80 80 80 80    
Orezone [Member]            
Disposal Group, Including Discontinued Operations [Line Items]            
Deferred cash consideration     $ 11,500,000      
Contingent Consideration, Description Orezone has a set-off right to reduce the unpaid balance of the Deferred Contingent Cash or the Contingent Cash Consideration payments by 50% of the amount by which the financial assurance required by the Quebec government under the updated Casa Berardi closure plan exceeds $150 million, excluding increases caused by Orezone's post-closing actions. Orezone has a set-off right to reduce the unpaid balance of the Deferred Contingent Cash or the Contingent Cash Consideration payments by 50% of the amount by which the financial assurance required by the Quebec government under the updated Casa Berardi closure plan exceeds $150 million, excluding increases caused by Orezone's post-closing actions. Orezone has a set-off right to reduce the unpaid balance of the Deferred Cash Consideration payments by 50% of the amount by which the financial assurance required by the Quebec government under the updated Casa Berardi closure plan exceeds $150 million, excluding increases caused by Orezone's post-closing actions. Orezone has a set-off right to reduce the unpaid balance of the Deferred Cash Consideration payments by 50% of the amount by which the financial assurance required by the Quebec government under the updated Casa Berardi closure plan exceeds $150 million, excluding increases caused by Orezone's post-closing actions.