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Note 8 - Financial Highlights (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Financial Highlights [Table Text Block]
    Three months Ended  
    March 31,  
    2020     2019  
Net asset value per Share, beginning of period   $ 16.24     $ 13.99  
                 

Net investment income(a)

    0.02       0.05  

Net realized and unrealized gain (loss)(b)

    (6.89 )     1.94  

Net increase (decrease) in net assets from operations

    (6.87 )     1.99  

Net asset value per Share, end of period

  $ 9.37     $ 15.98  
                 

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

    (42.30 )%     14.22 %

Ratio to average net assets:

               

Net investment income(e)

    0.59 %     1.41 %

Expenses(e)

    0.88 %     0.86 %