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Note 4 - Commitments, Contingencies and Obligations (Details) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 30, 2014
Oct. 31, 2013
Apr. 30, 2013
Aug. 31, 2012
Jun. 30, 2011
Dec. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Apr. 30, 2009
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                    
Maximum Environmental Remediation Obligation             $ 2,500,000      
Loss Contingency, Estimate of Possible Loss                   177,500
Payment Of Response Costs       1,100,000   1,100,000        
Other Accrued Liabilities, Noncurrent           300,000        
Estimated Response Costs         4,500,000          
Estimated Future Response Cost         100,000,000          
Proceeds from Issuance of Debt     500,000,000              
Debt Instrument, Interest Rate, Stated Percentage     6.875%       6.875%      
Contractual Obligations             13,000,000      
Noncapital Costs             6,100,000      
Commitments For Capital Lease Payments             21,600,000      
Environmental Expense and Liabilities 55,400,000 15,000,000         1,190,000 2,908,000    
Letters of Credit Outstanding, Amount                 1,300,000  
Casa Berardi [Member]
                    
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                    
Noncapital Costs             18,900,000      
Greens Creek [Member]
                    
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                    
Noncapital Costs             500,000      
Open Purchase Orders             6,400,000      
Lucky Friday [Member]
                    
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                    
Noncapital Costs             300,000      
Open Purchase Orders             200,000      
Non-Capital Costs [Member]
                    
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                    
Contractual Obligations             6,400,000      
Costs Incurred By The EPA [Member]
                    
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                    
Incurred Response Costs     200,000,000              
Minimum [Member]
                    
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                    
Loss Contingency, Estimate of Possible Loss           0        
Maximum [Member]
                    
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                    
Loss Contingency, Estimate of Possible Loss           $ 10,000,000