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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended 6 Months Ended
Nov. 30, 2009
shares
Nov. 18, 2009
USD ($)
$ / shares
shares
Jun. 30, 2022
$ / shares
$ / item
shares
Mar. 31, 2022
$ / shares
Dec. 31, 2021
$ / shares
Jun. 30, 2021
$ / shares
Mar. 31, 2021
$ / shares
Dec. 31, 2020
$ / shares
ORGANIZATION AND BUSINESS                
Number of successive valuation days     30          
Average daily percentage change in the price of the Benchmark Futures Contract considered     10.00%          
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / item     350          
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission 30,000,000              
Net asset value per share | $ / shares   $ 50.00 $ 17.68 $ 17.91 $ 11.65 $ 9.98 $ 7.89 $ 7.74
Number of units issued   200,000            
Value of unit issued | $   $ 10,000,000            
Commenced investment operations date Nov. 18, 2009              
Number of registered units     30,000,000          
Creation Baskets                
ORGANIZATION AND BUSINESS                
Number of units per basket | $ / item     50,000