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ORGANIZATION AND BUSINESS (Additional Information) (Details)
 1 Months Ended
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Mar. 31, 2017
$ / shares
$ / Unit
Dec. 31, 2016
$ / shares
Mar. 31, 2016
$ / shares
Dec. 31, 2015
$ / 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     1,000      
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission 30,000,000          
Net Asset Value Per Unit | $ / shares   $ 50.00 $ 7.57 $ 9.29 $ 6.64 $ 8.69
Number of units issued | shares   200,000        
Value of unit issued | $   $ 10,001,000        
Number of registered units     1,880,000,000      
Creation Baskets [Member]            
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]            
Number of units per basket     100,000      
Redemption Baskets [Member]            
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]            
Number of units per basket     100,000