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Note 8 - Financial Highlights (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Financial Highlights [Table Text Block]
   
December 31,
  
   
2018
    
2017
   
2016
 
                         
Net asset value per Share, beginning of year
   $
16.32
     $
15.62
 
   $
14.21
  
                         
Net investment income (loss)
(a)
    
0.15
      
(0.00)
(b)
    
(0.09
 )
Net realized and unrealized gain (loss)
(c)
    
(2.48
 )    
0.70
 
    
1.50
  
Net increase (decrease) in net assets from operations
    
(2.33
 )    
0.70
 
    
1.41
  
Net asset value per Share, end of year
   $
13.99
     $
16.32
 
   $
15.62
  
                         
Total return, at net asset value
(d)
    
(14.28
 )%    
4.48
%
    
9.92
 %
                         
Ratio to average net assets:
                        
Net investment income (loss)
    
0.90
 %    
(0.01
)%
    
(0.60
 )%
Expenses
    
0.85
 %    
0.87
%
    
0.87
 %