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% |