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Note 8 - Employee Benefit Plans (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Accumulated Benefit Obligation   $ 1,900,000 $ 1,600,000  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets   7.20%    
Long-term Investments 8,766,000 9,614,000 3,923,000  
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year 300,000      
Deferred Compensation Arrangement with Individual, Employer Contribution   407,000 246,000 229,000
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year (in Dollars) 700,000      
Pension Compensation [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 6.00%      
Pension Compensation In Excess Of Social Security Wages [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 5.70%      
Years One Through Five [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
CashBalancePayCreditPercentage 3.00%      
Years Six Through Ten [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
CashBalancePayCreditPercentage 4.50%      
After Ten Years [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
CashBalancePayCreditPercentage 6.00%      
Hecla Common Stock [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Long-term Investments   2,900,000 2,600,000  
Defined Benefit Plan, Actual Plan Asset Allocations   4.00%    
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Fair Value of Plan Assets   12,100,000    
Deferred Compensation Plan Assets     8,200,000  
Collective Investment Funds [Member] | Fair Value, Inputs, Level 3 [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Fair Value of Plan Assets   8,200,000    
Capital Accumulation Plans [Member] | Minimum [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent   1.00%    
Capital Accumulation Plans [Member] | Maximum [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent   50.00%    
Hecla Pension Plan [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year   1,000,000    
Unfunded Supplemental Executive Retirement Plan [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year   300,000    
Capital Accumulation Plans [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Contributions by Employer   2,500,000 2,200,000 2,100,000
Fair Value, Inputs, Level 3 [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Fair Value of Plan Assets   21,400,000    
Deferred Compensation Plan Assets     $ 16,900,000  
Minimum [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent   2.00%    
Maximum [Member]
        
Note 8 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent   50.00%