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Note 9 - Investing in Index Futures (Tables)
 6 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
  

Asset Derivatives

 

Fair Value

 Liability Derivatives 

Fair Value

 

June 30, 2025

           

Commodity contracts

 

Receivable for variation margin on open futures contracts

 $— Payable for variation margin on open futures contracts $4,437,061 
            

December 31, 2024

           

Commodity contracts

 

Receivable for variation margin on open futures contracts

 $3,037,571 Payable for variation margin on open futures contracts $— 
Derivative Instruments, Gain (Loss) [Table Text Block]
  

Statements of

Operations Location

 

Net Realized

Gain (Loss)

  

Net Change in Unrealized

Appreciation/Depreciation

 
Three Months Ended June 30, 2025          
Commodity contracts Net realized gain (loss) from futures contracts $(8,019,045) $— 
  Net change in unrealized appreciation/depreciation on futures contracts  —   (36,095,716)
           
Three Months Ended June 30, 2024          
Commodity contracts 

Net realized gain (loss) from futures contracts

 $(720,717) $— 
  Net change in unrealized appreciation/depreciation on futures contracts  —   (7,036,546)
           
Six Months Ended June 30, 2025          
Commodity contracts Net realized gain (loss) from futures contracts $30,163,105  $— 
  Net change in unrealized appreciation/depreciation on futures contracts  —   (37,481,779)
           
Six Months Ended June 30, 2024          
Commodity contracts 

Net realized gain (loss) from futures contracts

 $56,484,353  $— 
  Net change in unrealized appreciation/depreciation on futures contracts  —   17,525,300