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Note 7 - Commitments, Contingencies, and Obligations (Details)
1 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
Feb. 04, 2015
USD ($)
Feb. 04, 2015
Dec. 11, 2013
USD ($)
Apr. 12, 2013
USD ($)
Aug. 31, 2012
USD ($)
Jun. 30, 2011
USD ($)
Jul. 30, 2010
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Maximum Environmental Remediation Obligation                   $ 2,500,000  
Loss Contingency, Damages Sought, Value                 $ 5,000,000    
Contractual Obligations                   11,100,000  
Commitments For Capital Lease Payments                   18,700,000  
Surety Bonds                   100,200,000  
Loss Contingency, Number of Plaintiffs     4                
Loss Contingency, Estimate of Possible Loss     $ 1,000,000                
Johnny M Mine Area near San Mateo, New Mexico [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Payment Of Response Costs         $ 1,100,000     $ 1,100,000      
Estimated Response Costs                   5,600,000  
Liability for Remediation                   5,600,000  
Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Estimated Response Costs           $ 4,500,000          
Estimated Future Response Cost           $ 100,000,000          
Gilt Edge Site and Nelson Tunnel Commodore Site [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Liability for Remediation                   9,900,000  
Costs Incurred By The EPA [Member] | Gilt Edge Mine Superfund Site [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Incurred Response Costs             $ 225,000,000        
Revett Mining Company Inc [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Business Combination, Consideration Held for Reclamation                   $ 6,500,000  
Joint Venture [Member] | Rio Grande Silver Inc And Emerald Mining And Leasing LLC [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Equity Method Investment, Ownership Percentage                   70.00%  
Greens Creek [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Open Purchase Orders                   $ 1,000,000  
Noncapital Costs                   2,800,000  
Casa Berardi [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Open Purchase Orders                   800,000  
Noncapital Costs                   400,000  
Lucky Friday [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Noncapital Costs                   800,000  
United Steel Workers Local 5114 [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Litigation Settlement, Compensation Period   8 days                  
Litigation Settlement, Amount $ (13,000)                    
Senior Notes [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Proceeds from Issuance of Debt       $ 500,000,000              
Debt Instrument, Interest Rate, Stated Percentage       6.875%              
Debt Instrument, Increase (Decrease), Net                     $ 6,500,000
Minimum [Member] | Johnny M Mine Area near San Mateo, New Mexico [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Estimated Alternative Response Costs                   0  
Minimum [Member] | United Steel Workers Local 5114 [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Loss Contingency, Damages Sought, Value                   0  
Maximum [Member] | Johnny M Mine Area near San Mateo, New Mexico [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Estimated Alternative Response Costs                   221,000,000  
Maximum [Member] | United Steel Workers Local 5114 [Member]                      
Note 7 - Commitments, Contingencies, and Obligations (Details) [Line Items]                      
Loss Contingency, Damages Sought, Value                   $ 10,000,000