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Note 8 - Financial Highlights (Tables)
9 Months Ended
Sep. 30, 2015
Financial Highlights [Abstract]  
Financial Highlights [Table Text Block]
   

Three Months Ended
September 30,

   

Nine Months Ended
September 30,

 
   

2015

   

2014

   

2015

   

2014

 

Net asset value per Share, beginning of period

  $ 11.32     $ 12.74     $ 11.61     $ 11.66  
                                 

Net investment loss(a)

    (0.01 )     (0.01 )     (0.02 )     (0.02 )

Net realized and unrealized gain (loss)(b)

    (0.55 )     (0.95 )     (0.83 )     0.14  

Net increase (decrease) in net assets from operations

    (0.56 )     (0.96 )     (0.85 )     0.12  

Net asset value per Share, end of period

  $ 10.76     $ 11.78     $ 10.76     $ 11.78  
                                 

Total return(c)(d)

    (4.95

)%

    (7.54

)%

    (7.32

)%

    1.03

%

                                 

Ratio to average net assets:

                               

Net investment loss(e)

    (0.25

)%

    (0.25

)%

    (0.25

)%

    (0.25

)%

Expenses(e)

    0.25

%

    0.25

%

    0.25

%

    0.25

%