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CONTRACTS AND AGREEMENTS (Brokerage Commissions) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Floor Brokerage Exchange and Clearance Fees $ 771 $ 1,078 $ 2,601 $ 4,822
Percentage Of Average Daily Net Assets 0.03% 0.04% 0.03% 0.04%
Rebalancing Investments Transaction [Member]        
Floor Brokerage Exchange and Clearance Fees     $ 2,455 $ 3,593
Percentage Of Average Daily Net Assets 94.39% 74.51% 94.39% 74.51%
Creation And Redemption Activity [Member]        
Floor Brokerage Exchange and Clearance Fees     $ 146 $ 1,229
Percentage Of Average Daily Net Assets 5.61% 25.49% 5.61% 25.49%