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FINANCIAL HIGHLIGHTS (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Per Share Operating Performance: |  |  |  |
Net asset value, beginning of year | $ 12.91 | $ 20.91 | $ 15.18 |
Total income (loss) | 8.14 | (7.90) | 5.90 |
Total expenses | (0.18) | (0.10) | (0.17) |
Net increase (decrease) in net asset value | 7.96 | (8.00) | 5.73 |
Net asset value, end of year | $ 20.87 | $ 12.91 | $ 20.91 | $ 15.18
Total Return | 61.66% | (38.26%) | 37.75% |
Ratios to Average Net Assets |  |  |  |
Total income (loss) | 53.29% | 42.40% | 31.50% |
Management fees | 0.75% | 0.75% | 0.75% |
Total expenses excluding management fees | 0.34% |  | 0.38% | 0.24%
Expenses waived | (0.07%) | (0.23%) | (0.09%) |
Net expense excluding management fees | 0.27% | 0.15% | 0.15% |
Net income (loss) | 52.26% | 41.50% | 30.60% |

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