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FINANCIAL HIGHLIGHTS (Tables) | 6 Months Ended
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Jun. 30, 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 six months ended June 30, 2018 (Unaudited) |  |  | For the six months ended June 30, 2017 (Unaudited) |
Per Share Operating Performance: |  |  |  |  |  |  |  |
Net asset value, beginning of period |  | $ | 9.26 |  |  | $ | 11.75 |
Total income (loss) |  |  | 0.27 |  |  |  | (1.68 | )
Net expenses |  |  | (0.04 | ) |  |  | (0.05 | )
Net increase (decrease) in net asset value |  |  | 0.23 |  |  |  | (1.73 | )
Net asset value, end of period |  | $ | 9.49 |  |  | $ | 10.02 |
Total Return |  |  | 2.48 | % |  |  | (14.72 | )%
Ratios to Average Net Assets |  |  |  |  |  |  |  |
Total income (loss) |  |  | 3.03 | % |  |  | (20.02 | )%
Management fees* |  |  | 0.75 | % |  |  | 0.75 | %
Total expenses excluding management fees* |  |  | 1.10 | % |  |  | 0.57 | %
Expenses waived* |  |  | (0.95 | )% |  |  | (0.42 | )%
Net expenses excluding management fees* |  |  | 0.15 | % |  |  | 0.15 | %
Net income (loss) |  |  | 2.58 | % |  |  | (20.47 | )%
* | Annualized.

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