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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended
Nov. 30, 2009
Nov. 18, 2009
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
$ / item
Mar. 31, 2021
$ / shares
Dec. 31, 2020
$ / shares
Jun. 30, 2020
$ / shares
Mar. 31, 2020
$ / shares
Dec. 31, 2019
$ / 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     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 $ 9.98 $ 7.89 $ 7.74 $ 7.55 $ 7.63 $ 8.43
Number of units issued | shares   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     50,000          
Prior To July 1, 2011 [Member]                
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     50,000