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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended
Nov. 30, 2009
Nov. 18, 2009
USD ($)
$ / shares
shares
Dec. 31, 2019
$ / shares
$ / item
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Dec. 31, 2016
$ / 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 $ 8.43 $ 10.26 $ 9.26 $ 11.75
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