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FINANCIAL HIGHLIGHTS (Tables) | 6 Months Ended
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Jun. 30, 2017
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 six months ended June 30, 2017 (Unaudited) |  |  | For the six months ended June 30, 2016 (Unaudited) |
Per Share Operating Performance: |  |  |  |  |  |  |  |
Net asset value, beginning of period |  | $ | 11.71 |  |  | $ | 11.02 |
Total income (loss) |  |  | (2.20) |  |  |  | 0.58 |
Total expenses |  |  | (0.04) |  |  |  | (0.04) |
Net increase (decrease) in net asset value |  |  | (2.24) |  |  |  | 0.54 |
Net asset value, end of period |  | $ | 9.47 |  |  | $ | 11.56 |
Total Return |  |  | (19.13) | % |  |  | 4.90 | %
Ratios to Average Net Assets |  |  |  |  |  |  |  |
Total income (loss) |  |  | (17.32) | % |  |  | 13.58 | %
Management fees* |  |  | 0.45 | % |  |  | 0.45 | %
Expenses excluding management fees* |  |  | 0.30 | % |  |  | 0.33 | %
Net income (loss) |  |  | (17.69) | % |  |  | 13.19 | %
* Annualized.

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