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Note 9 - Shareholders' Equity (Tables)
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
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  

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 Dividends Payable [Table Text Block]  
   

(A)

   

(B)

   

(A+B)

           

Declaration date

 

Silver-price-linked component per share

   

Minimum annual component per share

   

Total dividend per share

   

Total dividend amount (in millions)

 

Month of payment

November 8, 2011

  $ 0.02     $ 0     $ 0.02     $ 5.6  

December 2011

February 17, 2012

  $ 0.01     $ 0.0025     $ 0.0125     $ 3.6  

March 2012

May 8, 2012

  $ 0.02     $ 0.0025     $ 0.0225     $ 6.4  

June 2012

August 7, 2012

  $     $ 0.0025     $ 0.0025     $ 0.7  

September 2012

November 2, 2012

  $ 0.02     $ 0.0025     $ 0.0225     $ 6.4  

December 2012

February 25, 2013

  $     $ 0.0025     $ 0.0025     $ 0.7  

anticipated in March 2013

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            

Warrants Outstanding

 

Warrants

   

Exercise Price

 

Expiration Date

                   

Series 1 warrants

    5,200,519     $ 2.41  

June 2014

Series 1 warrants

    460,976       2.52  

June 2014

Series 3 warrants

    16,671,128       2.46  

August 2014

                   

Total warrants outstanding

    22,332,623            
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]  
   

2010

 

Weighted average fair value of options granted

  $ 3.18  

Expected stock price volatility

    92.00

%

Risk-free interest rate

    1.43

%

Expected life of options (in years)

    2.9  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]  
   

Shares Subject to Options

   

Weighted Average

Exercise Price

 

Outstanding, December 31, 2011

    1,194,796     $ 6.72  

Expired

    (256,388

)

  $ 8.56  

Outstanding, December 31, 2012

    938,408     $ 6.23  
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, 2012

    561,276     $ 6.39  

Granted

    723,669     $ 4.51  

Canceled

    (16,461

)

  $ 7.29  

Distributed

    (231,338

)

  $ 6.65  

Unvested, December 31, 2012

    1,037,146     $ 5.11