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FINANCIAL HIGHLIGHTS (Tables) | 3 Months Ended
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Mar. 31, 2018
Financial Highlights [Abstract] |
Per Unit Performance Data and Other Supplemental Financial Data | This information has been derived from information presented in the condensed financial statements.
|  | For the three months ended March 31, 2018 (Unaudited) |  |  | For the three months ended March 31, 2017 (Unaudited) |
Per Share Operating Performance: |  |  |  |  |  |  |  |
Net asset value, beginning of period |  | $ | 9.26 |  |  | $ | 11.75 |
Total income (loss) |  |  | 0.05 |  |  |  | (1.08) |
Net expenses |  |  | (0.02) |  |  |  | (0.02) |
Net increase (decrease) in net asset value |  |  | 0.03 |  |  |  | (1.10) |
Net asset value, end of period |  | $ | 9.29 |  |  | $ | 10.65 |
Total Return |  |  | 0.32 | % |  |  | (9.36) | %
Ratios to Average Net Assets |  |  |  |  |  |  |  |
Total income (loss) |  |  | 0.88 | % |  |  | (13.70) | %
Management fees* |  |  | 0.75 | % |  |  | 0.75 | %
Total expenses excluding management fees* |  |  | 1.08 | % |  |  | 0.59 | %
Expenses waived* |  |  | (0.93) | % |  |  | (0.44) | %
Net expenses excluding management fees* |  |  | 0.15 | % |  |  | 0.15 | %
Net income (loss) |  |  | 0.65 | % |  |  | (13.92) | %
| * | Annualized.

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