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Note 6 - Business Segments (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
September 30,
    
Nine Months Ended
September 30,
  
   
2016
    
2015
    
2016
    
2015
  
Net sales to unaffiliated customers:
                                
Greens Creek
   $ 85,804     $ 54,351     $ 199,260     $ 175,749  
Lucky Friday
     26,140       13,916       70,152       48,376  
Casa Berardi
     41,131       36,674       126,614       104,105  
San Sebastian
     26,318       —       85,686       —  
    $ 179,393     $ 104,941     $ 481,712     $ 328,230  
Income (loss) from operations:
                                
Greens Creek
   $ 26,498     $ 21     $ 49,407     $ 24,664  
Lucky Friday
     6,652       (3,894
)
     13,442       (933
)
Casa Berardi
     3,691       (2,603
)
     16,246       (6,567
)
San Sebastian
     18,415       (2,420
)
     58,911       (7,269
)
Other
     (17,016
)
     (12,301
)
     (42,584
)
     (43,460
)
    $ 38,240     $ (21,197
)
   $ 95,422     $ (33,565
)
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
September 30, 2016
    
December 31, 2015
  
Identifiable assets:
                
Greens Creek
   $ 696,209     $ 698,265  
Lucky Friday
     437,925       393,338  
Casa Berardi
     799,570       779,423  
San Sebastian
     23,109       22,238  
Other
     406,866       328,661  
    $ 2,363,679     $ 2,221,925