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Note 6 - Business Segments (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
   
2016
    
2015
    
2016
    
2015
  
Net sales to unaffiliated customers:
                                
Greens Creek
   $ 59,574     $ 54,043     $ 113,456     $ 121,398  
Lucky Friday
     22,760       14,570       44,012       34,460  
Casa Berardi
     53,285       35,584       85,483       67,431  
San Sebastian
     35,683       —       59,368       —  
    $ 171,302     $ 104,197     $ 302,319     $ 223,289  
Income (loss) from operations:
                                
Greens Creek
   $ 14,831     $ 9,950     $ 22,909     $ 24,643  
Lucky Friday
     4,047       (585
)
     6,790       2,961  
Casa Berardi
     10,622       (3,200
)
     12,556       (3,964
)
San Sebastian
     25,583       —       40,495       —  
Other
     (13,473
)
     (23,455
)
     (25,567
)
     (36,008
)
    $ 41,610     $ (17,290
)
   $ 57,183     $ (12,368
)
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
June 30, 2016
    
December 31, 2015
  
Identifiable assets:
                
Greens Creek
   $ 693,948     $ 698,265  
Lucky Friday
     427,812       393,338  
Casa Berardi
     792,267       779,423  
San Sebastian
     24,483       22,238  
Other
     332,300       328,661  
    $ 2,270,810     $ 2,221,925