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FINANCIAL HIGHLIGHTS (Details) - $ / shares | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Per Share Operating Performance: |  |  |
Net asset value, beginning of period |  | $ 15.7 | $ 12.22
Total income (loss) |  | (2.67) | 2.7
Net expenses |  | (0.06) | (0.06)
Net increase (decrease) in net asset value |  | (2.73) | 2.64
Net asset value, end of period |  | $ 12.97 | $ 14.86
Total Return |  | (17.39%) | 21.60%
Ratios to Average Net Assets |  |  |
Total income (loss) |  | (16.34%) | 27.11%
Management fees | [1] | 0.75% | 0.75%
Total expenses excluding management fees | [1] | 0.51% | 0.32%
Expenses waived | [1] | (0.36%) | (0.17%)
Net expenses excluding management fees | [1] | 0.15% | 0.15%
Net income (loss) |  | (16.79%) | 26.67%
[1] | Annualized.

X
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- Definition Representing per share value of total income. + References No definition available. + Details
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