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ORGANIZATION AND BUSINESS (Additional Information) (Details)
Dec. 06, 2007
USD ($)
$ / shares
shares
Dec. 04, 2007
Sep. 30, 2016
Contracts
$ / shares
$ / Units
Dec. 31, 2015
$ / shares
Sep. 30, 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   11,000,000        
Net asset value per share | $ / shares $ 50.00   $ 18.75 $ 17 $ 20.45 $ 26.59
Number of shares issued | shares 300,000          
Value of shares issued | $ $ 15,000,000          
Number of registered shares     111,000,000      
Creation Baskets            
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]            
Number of shares per basket     50,000      
Open Futures Contracts, Long | United States            
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]            
Number of Contracts | Contracts [1]     2,425      
[1] Collateral amounted to $7,994,581 on open futures contracts.