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Note 4 - Commitments, Contingencies and Obligations (Details)
1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended
Jun. 24, 2015
USD ($)
Feb. 04, 2015
USD ($)
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 ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 06, 2015
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Equity Method Investment, Ownership Percentage                   100.00%    
Maximum Environmental Remediation Obligation                   $ 2,500,000    
Loss Contingency, Damages Sought, Value                 $ 5,000,000      
Contractual Obligations                   28,400,000    
Commitments For Capital Lease Payments                   22,700,000    
Surety Bonds                   94,300,000    
Letters of Credit Outstanding, Amount                   8,000,000    
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 4 - 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 4 - 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 4 - 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 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Incurred Response Costs             $ 225,000,000          
Revett Mining Company, Inc. [Member]                        
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Debt Instrument, Interest Rate, Stated Percentage                       6.25%
Business Combination, Consideration Held for Reclamation                   $ 6,500,000    
Joint Venture [Member] | Rio Grande Silver Inc And Emerald Mining And Leasing LLC [Member]                        
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Equity Method Investment, Ownership Percentage                   70.00%    
Lucky Friday [Member]                        
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Settlement Agreement, Amount $ (600,000)                      
Open Purchase Orders                   $ 2,400,000    
Noncapital Costs                   1,500,000    
Greens Creek [Member]                        
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Open Purchase Orders                   6,900,000    
Noncapital Costs                   6,600,000    
Casa Berardi [Member]                        
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Open Purchase Orders                   700,000    
Noncapital Costs                   1,700,000    
United Steel Workers, Local 5114 [Member]                        
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Litigation Settlement, Compensation Period   8 days                    
Litigation Settlement, Amount   $ (13,000)                    
Senior Notes [Member]                        
Note 4 - 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 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Estimated Alternative Response Costs                   0    
Minimum [Member] | United Steel Workers, Local 5114 [Member]                        
Note 4 - 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 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Estimated Alternative Response Costs                   221,000,000    
Maximum [Member] | United Steel Workers, Local 5114 [Member]                        
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items]                        
Loss Contingency, Damages Sought, Value                   $ 10,000,000