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Note 8 - Shareholders' Equity (Tables)
3 Months Ended
Mar. 31, 2014
Stockholders' Equity Note [Abstract]  
Schedule of Potential Per Share Dividend Amounts Quarterly Price Levels [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

    16,646,128         2.45    

August 2014

Total warrants outstanding

    22,307,623