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Note 8 - Financial Highlights (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Financial Highlights [Table Text Block]
   
Th
ree Months Ended
September 30,
    
Nine
Months Ended
September 30,
  
   
2017
    
2016
    
2017
    
2016
  
Net asset value per Share, beginning of period
   $
11.95
     $
12.73
     $
11.16
     $
10.25
  
                                 
Net investment loss
(a)
    
(0.01
 )    
(0.01
 )    
(0.02
 )    
(0.02
 )
Net realized and unrealized gain
(b)
    
0.39
      
0.02
      
1.19
      
2.51
  
Net increase in net assets from operations
    
0.38
      
0.01
      
1.17
      
2.49
  
Net asset value per Share, end of period
   $
12.33
     $
12.74
     $
12.33
     $
12.74
  
                                 
Total return, at net asset value
(c)(d)
    
3.18
%
    
0.08
%
    
10.48
%
    
24.29
%
                                 
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
%