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Note 9 - Investing in Index Futures (Tables)
 3 Months Ended
Mar. 31, 2026
Notes Tables  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
    Asset Derivatives   Fair Value   Liability Derivatives   Fair Value  
March 31, 2026                      
Commodity contracts   Receivable for variation margin on open futures contracts   $ —   Payable for variation margin on open futures contracts   $ 5,504,689  
                       
December 31, 2025                      
Commodity contracts   Receivable for variation margin on open futures contracts   $ —   Payable for variation margin on open futures contracts   $ 11,332,892  
Derivative Instruments, Gain (Loss) [Table Text Block]
   

Statements of

Operations Location

  

Net Realized

Gain (Loss)

    

Net Change in Unrealized

Appreciation/Depreciation

  
Three Months Ended March 31, 2026                    
Commodity contracts   Net realized gain (loss) from futures contracts   $ 227,639,802     $ —  
   

Net change in unrealized appreciation/depreciation on futures contracts

     —       82,570,068  
                     
Three Months Ended March 31, 2025                    
Commodity contracts   Net realized gain (loss) from futures contracts   $ 38,182,150     $ —  
    Net change in unrealized appreciation/depreciation on futures contracts     —       (1,386,063 )