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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended 12 Months Ended
Nov. 30, 2009
shares
Nov. 18, 2009
USD ($)
$ / shares
shares
Dec. 31, 2021
$ / shares
$ / item
shares
Dec. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
ORGANIZATION AND BUSINESS            
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 $ 11.65 $ 7.74 $ 8.43 $ 10.26
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 [Member]            
ORGANIZATION AND BUSINESS            
Number of units per basket | $ / item     50,000