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ORGANIZATION AND BUSINESS (Details)
Dec. 06, 2007
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
contract
$ / shares
shares
Jun. 30, 2025
$ / shares
Dec. 31, 2024
$ / shares
Sep. 30, 2024
$ / shares
Jun. 30, 2024
$ / shares
Dec. 31, 2023
$ / shares
Dec. 04, 2007
shares
ORGANIZATION AND BUSINESS                
Number of oil futures contracts held | contract   665            
Number of registered shares               11,000,000
Net asset value per share | $ / shares $ 50 $ 35.5 $ 35.19 $ 38.01 $ 35.91 $ 40.54 $ 35.23  
Number of shares issued 300,000              
Value of shares issued | $ $ 15,000,000              
Creation Baskets                
ORGANIZATION AND BUSINESS                
Number of shares per basket   50,000            
Fee paid by authorized purchasers for each order they place to create one or more creation baskets or to redeem one or more baskets | $   $ 350