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Note 6 - Business Segments (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
   
2017
    
2016
    
2017
    
2016
  
Net sales to unaffiliated customers:
                                
Greens Creek
   $
71,339
     $
59,574
     $
130,189
     $
113,456
  
Lucky Friday
    
(187
)
    
22,760
      
19,823
      
44,012
  
Casa Berardi
    
43,822
      
53,285
      
85,534
      
85,483
  
San Sebastian
    
19,305
      
35,683
      
41,277
      
59,368
  
    $
134,279
     $
171,302
     $
276,823
     $
302,319
  
Income (loss) from operations:
                                
Greens Creek
   $
15,418
     $
14,831
     $
29,532
     $
22,909
  
Lucky Friday
    
(8,212
)
    
4,047
      
(4,332
)
    
6,790
  
Casa Berardi
    
(1,708
)
    
10,622
      
(3,953
)
    
12,556
  
San Sebastian
    
11,892
      
25,583
      
25,346
      
40,495
  
Other
    
(13,415
)
    
(13,473
)
    
(26,747
)
    
(25,567
)
    $
3,975
     $
41,610
     $
19,846
     $
57,183
  
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
June 30, 2017
    
December 31, 2016
  
Identifiable assets:
                
Greens Creek
   $
674,210
     $
681,303
  
Lucky Friday
    
431,331
      
442,829
  
Casa Berardi
    
807,180
      
806,044
  
San Sebastian
    
43,268
      
33,608
  
Other
    
423,167
      
407,893
  
    $
2,379,156
     $
2,371,677