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Note 8 - Shareholders' Equity (Tables)
6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Dividend Payment Restrictions [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