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Note 8 - Financial Highlights (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Financial Highlights [Table Text Block]
 
 
December 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Net asset value per Share, beginning of year
   $
10.25
     $
11.61
     $
11.66
  
                         
Net investment loss
(a)
    
(0.03
 )    
(0.03
 )    
(0.03
 )
Net realized and unrealized gain (loss)
(b)
    
0.94
      
(1.33
 )    
(0.02
 )
Net increase (decrease) in net assets from operations
    
0.91
      
(1.36
 )    
(0.05
 )
Net asset value per Share, end of year
   $
11.16
     $
10.25
     $
11.61
  
                         
Total return, at net asset value
(c)
    
8.88
%
    
(11.71
)
%
    
(0.43
)
%
                         
Ratio to average net assets:
                        
Net investment loss
    
(0.25
)
%
    
(0.25
)
%
    
(0.25
)
%
Expenses
    
0.25
%
    
0.25
%
    
0.25
%