v3.26.3
Note 10 - Investment Valuation (Tables)
9 Months Ended
Sep. 30, 2026
Notes Tables  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
  

Level 1

  

Level 2

  

Level 3

  

Total

 

September 30, 2026

                

Futures contracts(a)

 $(10,205,049) $—  $—  $(10,205,049)

U.S. Treasury bills

  —   1,017,450,044   —   1,017,450,044 

December 31, 2025

                

Futures contracts(a)

  (14,025,327)  —   —   (14,025,327)

U.S. Treasury bills

  —   1,093,235,756   —   1,093,235,756