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ORGANIZATION AND BUSINESS (Additional Information) (Details)
Dec. 06, 2007
USD ($)
$ / shares
shares
Jun. 30, 2017
$ / shares
Jun. 30, 2017
Contracts
Jun. 30, 2017
$ / Units
Jun. 30, 2017
$ / Unit
Dec. 31, 2016
$ / shares
Jun. 30, 2016
$ / shares
Dec. 31, 2015
$ / shares
Dec. 04, 2007
Contracts
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 50,000        
Net asset value per share | $ / shares $ 50.00 $ 16.79       $ 20.39 $ 19.34 $ 17  
Number of shares issued | shares 300,000                
Value of shares issued | $ $ 15,000,000                
Number of registered shares     111,000,000           11,000,000
Creation Baskets                  
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                  
Number of shares per basket | $ / Units       50,000          
Redemption Baskets [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                  
Number of shares per basket | $ / Unit         2,415        
Open Futures Contracts, Long | United States                  
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                  
Number of Contracts [1]     2,415            
[1] Collateral amounted to $25,688,812 on open futures contracts.