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Note 9 - Investing in Index Futures (Tables)
 9 Months Ended
Sep. 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 
September 30, 2025           
Commodity contracts Receivable for variation margin on open futures contracts $— 

Payable for variation margin on open futures contracts

 $8,121,169 
            
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 September 30, 2025          
Commodity contracts Net realized gain (loss) from futures contracts $17,956,102  $— 
  Net change in unrealized appreciation/depreciation on futures contracts  —   11,839,522 
           
Three Months Ended September 30, 2024          
Commodity contracts Net realized gain (loss) from futures contracts $(77,701,360) $— 
  Net change in unrealized appreciation/depreciation on futures contracts  —   6,815,884 
           
Nine Months Ended September 30, 2025          
Commodity contracts Net realized gain (loss) from futures contracts $48,119,207  $— 
  Net change in unrealized appreciation/depreciation on futures contracts  —   (25,642,257)
           
Nine Months Ended September 30, 2024          
Commodity contracts Net realized gain (loss) from futures contracts $(21,217,007) $— 
  Net change in unrealized appreciation/depreciation on futures contracts  —   24,341,184