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FINANCIAL HIGHLIGHTS (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Per Share Operating Performance: |  |  |
Net asset value, beginning of year | $ 20.91 | $ 15.18 | $ 18.18
Total income (loss) | (7.90) | 5.90 | (2.82)
Total expenses | (0.10) | (0.17) | (0.18)
Net increase (decrease) in net asset value | (8.00) | 5.73 | (3.00)
Net asset value, end of year | $ 12.91 | $ 20.91 | $ 15.18
Total Return | (38.26%) | 37.75% | (16.50%)
Ratios to Average Net Assets |  |  |
Total income (loss) | 42.40% | 31.50% | (14.88%)
Management fees | 0.75% | 0.75% | 0.75%
Expenses excluding management fees | 0.38% | 0.24% | 0.23%
Expense waived | (0.23%) | (0.09%) | (0.08%)
Net expense excluding management fees | 0.15% | 0.15% | 0.15%
Net income (loss) | 41.50% | 30.60% | (15.78%)

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