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Note 8 - Financial Highlights (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Financial Highlights [Table Text Block]
  

Three Months Ended

June 30,

  

Six Months Ended

June 30,

 
  2025  2024  2025  2024 

Net asset value per Share, beginning of period

 $22.75  $22.10  $21.74  $20.08 

Net investment income(a)

  0.19   0.24   0.38   0.49 

Net realized and unrealized gain (loss)(b)

  (0.88)  (0.15)  (0.06)  1.62 

Net increase (decrease) in net assets from operations

  (0.69)  0.09   0.32   2.11 

Net asset value per Share, end of period

 $22.06  $22.19  $22.06   22.19 
                 

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

  (3.03)%  0.41%  1.47%  10.51%
                 
Ratio to average net assets:                

Net investment income(e)

  3.44%  4.41%  3.48%  4.51%

Expenses(e)

  0.83%  0.82%  0.82%  0.83%