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ORGANIZATION AND BUSINESS (Details) - USD ($)
 1 Months Ended 3 Months Ended
Jan. 04, 2018
Jan. 04, 2018
Apr. 18, 2007
Apr. 30, 2007
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
ORGANIZATION AND BUSINESS                  
Average daily percentage change in the price of the Benchmark Futures Contract considered         10.00%        
Number of units per basket         100,000        
Fee paid by authorized participants for each order placed to create one or more Creation Baskets or to redeem one or more baskets         $ 1,000        
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission       30,000,000          
Net asset value per unit         $ 7.01 $ 14.22 $ 14.22 $ 19.69 $ 12.39
Number of units issued     200,000            
Value of unit issued     $ 10,001,000            
Committee For Uniform Securities Identification Procedure Cusip   912318300              
Stockholders equity reverse stock 0.25                
Prior to Reverse Split                  
ORGANIZATION AND BUSINESS                  
Net asset value per unit $ 5.69 $ 5.69 $ 50.00            
Stockholders equity reverse stock 0.25                
Capital units issued 97,466,476 97,466,476              
Capital units outstanding 97,466,476 97,466,476              
Following Reverse Split                  
ORGANIZATION AND BUSINESS                  
Net asset value per unit $ 22.76 $ 22.76              
Capital units issued 24,366,619 24,366,619              
Capital units outstanding 24,366,619 24,366,619              
Creation Baskets                  
ORGANIZATION AND BUSINESS                  
Number of units per basket         100,000