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FINANCIAL HIGHLIGHTS (Per share Performance Data and Other Supplemental Financial Data) (Detail) - $ / shares | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Per Share Operating Performance: |  |  |
Net asset value, beginning of period |  | $ 12.08 | $ 11.71
Total income (loss) |  | 2.99 | (2.20)
Total expenses |  | (0.05) | (0.04)
Net increase (decrease) in net asset value |  | 2.94 | (2.24)
Net asset value, end of period |  | $ 15.02 | $ 9.47
Total Return |  | 24.34% | (19.13%)
Ratios to Average Net Assets |  |  |
Total income (loss) |  | 22.33% | (17.32%)
Management fees | [1] | 0.45% | 0.45%
Expenses excluding management fees | [1] | 0.28% | 0.30%
Net income (loss) |  | 21.97% | (17.69%)
[1] | Annualized.

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