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Note 9 - Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2013
Stockholders' Equity Note [Abstract]  
Dividend Payment Restrictions [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 Dividends Payable [Table Text Block]
   

(A)

   

(B)

   

(C)

   

(A+B+C)

           

Declaration date

 

Silver-price-linked component per share

   

Minimum annual component per share

   

Special dividend per share

   

Total dividend per share

   

Total dividend amount (in millions)

 

Month of payment

November 8, 2011

  $ 0.02     $     $     $ 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     $ 0.01     $ 0.0125     $ 3.6  

March 2013

May 10, 2013

  $     $ 0.0025     $     $ 0.0025     $ 0.7  

June 2013

August 8, 2013

  $     $ 0.0025     $     $ 0.0025     $ 0.9  

August 2013

November 5, 2013

  $     $ 0.0025     $     $ 0.0025     $ 0.9  

December 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

    16,646,128       2.45  

August 2014

                   

Total warrants outstanding

    22,307,623            
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

Shares Subject to Options

   

Weighted Average

Exercise Price

 

Outstanding, December 31, 2012

    938,408     $ 6.23  

Expired

    (325,663

)

  $ 9.88  

Outstanding, December 31, 2013

    612,745     $ 4.29  
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, 2013

    1,037,146     $ 5.11  

Granted

    1,592,708     $ 2.93  

Canceled

    (17,962

)

  $ 3.34  

Distributed

    (526,591

)

  $ 4.70  

Unvested, December 31, 2013

    2,085,301     $ 3.56