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CONTRACTS AND AGREEMENTS (Brokerage Commissions) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Floor Brokerage Exchange and Clearance Fees $ 872 $ 2,149 $ 1,830 $ 3,744
Percentage Of Average Daily Net Assets 0.03% 0.04% 0.03% 0.04%
Rebalancing Investments Transaction [Member]        
Floor Brokerage Exchange and Clearance Fees     $ 1,684 $ 2,515
Percentage Of Average Daily Net Assets 92.02% 67.17% 92.02% 67.17%
Creation And Redemption Activity [Member]        
Floor Brokerage Exchange and Clearance Fees     $ 146 $ 1,229
Percentage Of Average Daily Net Assets 7.98% 32.83% 7.98% 32.83%