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Note 8 - Financial Highlights (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Financial Highlights [Table Text Block]
  

December 31,

 
  

2025

  

2024

  

2023

 

Net asset value per Share, beginning of year

 $26.33  $21.78  $22.03 
             

Net investment loss(a)

  (0.18)  (0.13)  (0.11)

Net realized and unrealized gain (loss)(b)

  39.12   4.68   (0.14)

Net increase (decrease) in net assets from operations

  38.94   4.55   (0.25)

Net asset value per Share, end of year

 $65.27  $26.33  $21.78 
             

Total return, at net asset value(c)

  147.89%  20.89%  (1.13)%
             

Ratio to average net assets:

            

Net investment loss

  (0.50)%  (0.50)%  (0.50)%

Expenses

  0.50%  0.50%  0.50%