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FINANCIAL HIGHLIGHTS (Details) - $ / shares | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Per Share Operating Performance: |  |  |
Net asset value, beginning of period |  | $ 18.18 | $ 15.70
Total income (loss) |  | 5.24 | (0.41)
Net expenses |  | (0.14) | (0.10)
Net increase (decrease) in net asset value |  | 5.10 | (0.51)
Net asset value, end of period |  | $ 23.28 | $ 15.19
Total Return |  | 28.05% | (3.25%)
Ratios to Average Net Assets |  |  |
Total income (loss) |  | 24.86% | (1.30%)
Management fees | [1] | 0.75% | 0.75%
Total expenses excluding management fees | [1] | 0.26% | 0.48%
Expenses waived | [1] | (0.11%) | (0.33%)
Net expenses excluding management fees | [1] | 0.15% | 0.15%
Net income (loss) |  | 24.18% | (1.97%)
[1] | Annualized.

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