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Note 8 - Financial Highlights (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Financial Highlights [Table Text Block]
 
 
Three Months Ended
September 30,
 
 
Nine Months Ended
September 30,
 
 
 
2016
 
 
2015
 
 
2016
 
 
2015
 
Net asset value per Share, beginning of period
  $ 17.45     $ 15.00     $ 13.17     $ 15.29  
                                 
Net investment loss
(a)
    (0.02 )     (0.02 )     (0.06 )     (0.06 )
Net realized and unrealized gain (loss)
(b)
    0.94       (1.00 )     5.26       (1.25 )
Net increase (decrease) in net assets from operations
    0.92       (1.02 )     5.20       (1.31 )
Net asset value per Share, end of period
  $ 18.37     $ 13.98     $ 18.37     $ 13.98  
                                 
Total return, at net asset value
(c)(d)
    5.27
%
    (6.80
)
%
    39.48
%
    (8.57
)
%
                                 
Ratio to average net assets:
                               
Net investment loss
(e)
    (0.50
)
%
    (0.50
)
%
    (0.50
)
%
    (0.50
)
%
Expenses
(e)
    0.50
%
    0.50
%
    0.50
%
    0.50
%