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Note 6. Business Segments (Tables)
 6 Months Ended
Jun. 30, 2012
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
   
2012
   
2011
    2012    
2011
 
Net sales to unaffiliated customers:
               
Greens Creek
 
$
67,023
   
$
81,816
   
$
157,923
   
$
183,618
 
Lucky Friday
 
(4
)
 
36,044
   
249
   
70,606
 
   
$
67,019
   
$
117,860
   
$
158,172
   
$
254,224
 
Income (loss) from operations:
               
Greens Creek
 
$
23,313
   
$
45,054
   
$
70,695
   
$
103,563
 
Lucky Friday
 
(6,498
)
 
20,596
   
(12,441
)
 
40,508
 
Other
 
(19,296
)
 
(11,859
)
 
(35,299
)
 
(21,545
)
   
$
(2,481
)
 
$
53,791
   
$
22,955
   
$
122,526
 
Identifiable Assets By Reportable Segment
   
June 30, 2012
   
December 31, 2011
 
Identifiable assets:
           
Greens Creek
  $ 738,109     $ 729,289  
Lucky Friday
    226,516       213,285  
Other
    425,869       453,516  
    $ 1,390,494     $ 1,396,090