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Note 8. Shareholders' Equity (Tables)
6 Months Ended
Jun. 30, 2012
Schedule of Dividend Payment Restrictions [Table Text Block]
Quarterly average realized silver price per ounce
 
Quarterly dividend per share
   
Annualized dividend per share
 
$30
  $ 0.01     $ 0.04  
$35
  $ 0.02     $ 0.08  
$40
  $ 0.03     $ 0.12  
$45
  $ 0.04     $ 0.16  
$50
  $ 0.05     $ 0.20  
$55
  $ 0.06     $ 0.24  
$60
  $ 0.07     $ 0.28  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Warrants Outstanding
 
Warrants
 
Exercise Price
 
Expiration Date
Series 1 warrants
 
5,200,519
 
$
2.42
 
June 2014
Series 1 warrants
 
460,976
 
2.53
 
June 2014
Series 3 warrants
 
16,671,128
 
2.47
 
August 2014
Total warrants outstanding
 
22,332,623