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FINANCIAL HIGHLIGHTS (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Per Share Operating Performance: |  |  |
Net asset value, beginning of year | $ 15.7 | $ 12.22 | $ 22.39
Total income (loss) | 2.61 | 3.6 | (10)
Net expenses | (0.13) | (0.12) | (0.17)
Net increase (decrease) in net asset value | 2.48 | 3.48 | (10.17)
Net asset value, end of year | $ 18.18 | $ 15.7 | $ 12.22
Total Return | 15.80% | 28.48% | (45.42%)
Ratios to Average Net Assets |  |  |
Total income (loss) | 16.22% | 34.23% | (46.52%)
Management fees | 0.75% | 0.75% | 0.75%
Total expenses excluding management fees | 0.48% | 0.32% | 0.30%
Expenses waived | (0.33%) | (0.17%) | (0.15%)
Net expenses excluding management fees | 0.15% | 0.15% | 0.15%
Net income (loss) | 15.32% | 33.33% | (47.42%)

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