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Note 8 - Financial Highlights (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Financial Highlights [Table Text Block]
   

Three Months Ended
September
30,

   

Nine Months Ended
September
30,

 
   

2020

   

2019

   

2020

   

2019

 

Net asset value per Share, beginning of period

  $ 16.62     $ 14.25     $ 16.85     $ 14.52  
                                 

Net investment loss(a)

    (0.03 )     (0.02 )     (0.07 )     (0.06 )

Net realized and unrealized gain(b)

    5.49       1.91       5.30       1.68  

Net increase in net assets from operations

    5.46       1.89       5.23       1.62  

Net asset value per Share, end of period

  $ 22.08     $ 16.14     $ 22.08     $ 16.14  
                                 

Total return, at net asset value(c)(d)

    32.85 %     13.26 %     31.04 %     11.16 %
                                 

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 %