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Note 8 - Shareholders' Equity (Tables)
3 Months Ended
Mar. 31, 2013
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     $ 2.40  
June 2014
Series 1 warrants
    460,976       2.51  
June 2014
Series 3 warrants
    16,671,128       2.45  
August 2014
Total warrants outstanding
    22,332,623