XML 59 R32.htm IDEA: XBRL DOCUMENT v3.6.0.2
Note 10 - Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
December 31, 2016
 
Ounces/pounds under contract (in 000's)
 
 
Average price per ounce/pound
 
 
 
Silver
 
 
Gold
 
 
Zinc
 
 
Lead
 
 
Silver
 
 
Gold
 
 
Zinc
 
 
Lead
 
 
 
(ounces)
 
 
(ounces)
 
 
(pounds)
 
 
(pounds)
 
 
(ounces)
 
 
(ounces)
 
 
(pounds)
 
 
(pounds)
 
Contracts on provisional sales
                                                                
2017 settlements
    
1,295
      
4
      
19,070
      
7,441
     $
16.29
     $
1,172
     $
1.18
     $
0.97
  
Contracts on forecasted sales
                                                                
2017 settlements
    
—
      
—
      
35,384
      
17,637
      
N/A
      
N/A
     $
1.19
     $
1.03
  
2018 settlements
    
—
      
—
      
13,779
      
5,732
      
N/A
      
N/A
     $
1.21
     $
1.05
  
December 31, 2015
 
Ounces/pounds under contract (in 000's)
 
 
Average price per ounce/pound
 
 
 
Silver
 
 
Gold
 
 
Zinc
 
 
Lead
 
 
Silver
 
 
Gold
 
 
Zinc
 
 
Lead
 
 
 
(ounces)
 
 
(ounces)
 
 
(pounds)
 
 
(pounds)
 
 
(ounces)
 
 
(ounces)
 
 
(pounds)
 
 
(pounds)
 
Contracts on provisional sales
                                                                
2016 settlements
    
1,368
      
5
      
23,755
      
8,433
      
14.12
      
1,076
     $
0.71
     $
0.77