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ORGANIZATION AND BUSINESS (Additional Information) (Details)
 1 Months Ended
Nov. 30, 2009
Nov. 18, 2009
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
$ / Basket
Dec. 31, 2017
$ / shares
Dec. 31, 2016
$ / shares
Dec. 31, 2015
$ / shares
Dec. 31, 2014
$ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
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 $ 10.26 $ 9.26 $ 11.75 $ 9.72 $ 9.72
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, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
Number of units per basket     50,000        
Prior To July 1, 2011 [Member]              
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
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