XML 44 R21.htm IDEA: XBRL DOCUMENT v3.3.0.814
Organization and Business (Additional Information) (Details)
Dec. 06, 2007
USD ($)
$ / shares
shares
Dec. 04, 2007
Sep. 30, 2015
$ / shares
Sep. 30, 2015
Contracts
 [1]
Sep. 30, 2015
$ / Units
Sep. 30, 2015
Dec. 31, 2014
$ / shares
Sep. 30, 2014
$ / shares
Dec. 31, 2013
$ / 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   $ 20.45       $ 26.59 $ 41.80 $ 42.83
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       1,475   1,475      
[1] Collateral amounted to $21,063,388 on open future contracts.