XML 63 R32.htm IDEA: XBRL DOCUMENT v2.4.0.6
Note 9. Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2011
Schedule of Dividend Payment Restrictions [Table Text Block]
Quarterly average realized
silver price per ounce
 
Quarterly dividend per
share
 
Annual 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 [Table Text Block]
   
Shares
   
Value
 
Common Stock
    17,391,302     $ 43,393  
Series 4 warrants to purchase Common Stock
    12,173,913       14,168  
Total
          $ 57,561  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Warrants Outstanding
 
Warrants
   
Exercise Price
 
Expiration Date
               
Series 1 warrants
    5,200,519     $ 2.44  
June 2014
Series 1 warrants
    460,976       2.55  
June 2014
Series 3 warrants
    16,671,128       2.49  
August 2014
                   
Total warrants outstanding
    22,332,623            
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
2010
 
2009
Weighted average fair value of options granted
  $ 3.18     $ 3.42  
Expected stock price volatility
    92.00 %     90.00 %
Risk-free interest rate
    1.43 %     1.99 %
Expected life of options
 
2.9 years
 
2.7 years
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
Shares Subject to
Options
 
Weighted Average
Exercise Price
Outstanding, December 31, 2010
1,269,668
 
$
6.68
 
Exercised
(74,872)
 
$
6.40
 
Outstanding, December 31, 2011
1,194,796
 
$
6.72
 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
Shares
 
Weighted Average
Grant Date Fair
Value per Share
Unvested, January 1, 2011
388,501
 
$
4.94
 
Granted
498,576
 
$
6.98
 
Canceled
(10,975)
 
$
7.29
 
Distributed
(314,826)
 
$
5.50
 
Unvested, December 31, 2011
561,276
 
$
6.39