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CONTRACTS AND AGREEMENTS (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Brokerage commissions $ 165,409 $ 114,922 $ 27,058
Percentage Of Average Daily Net Assets 0.15% 0.12% 0.07%
Rebalancing Investments Transaction [Member]      
Brokerage commissions $ 160,817 $ 107,744 $ 24,246
Percentage Of Average Daily Net Assets 97.22% 93.75% 89.61%
Creation And Redemption Activity [Member]      
Brokerage commissions $ 4,592 $ 7,178 $ 2,812
Percentage Of Average Daily Net Assets 2.78% 6.25% 10.39%