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FINANCIAL HIGHLIGHTS (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Per Share Operating Performance: |  |  |
Net asset value, beginning of year | $ 12.22 | $ 22.39 | $ 43.81
Total income (loss) | 3.60 | (10.00) | (21.06)
Net expenses | (0.12) | (0.17) | (0.36)
Net increase (decrease) in Net Asset Value | 3.48 | (10.17) | (21.42)
Net asset value, end of year | $ 15.70 | $ 12.22 | $ 22.39
Total Return | 28.48% | (45.42%) | (48.89%)
Ratios to Average Net Assets |  |  |
Total income (loss) | 34.23% | (46.52%) | (68.25%)
Management fees | 0.75% | 0.75% | 0.75%
Total expenses excluding management fees | 0.32% | 0.30% | 0.56%
Expenses waived | (0.17%) | (0.15%) | (0.39%)
Net expenses excluding management fees | 0.15% | 0.15% | 0.17%
Net income (loss) | 33.33% | (47.42%) | (69.17%)

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