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FINANCIAL HIGHLIGHTS (Details) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Per Share Operating Performance: |  |  |  |
Net asset value, beginning of period | $ 7.97 | $ 19.22 | $ 20.91 | $ 15.18
Total income (loss) | 2.82 | (0.05) | (10.10) | 4.03
Total expenses | (0.02) | (0.04) | (0.04) | (0.08)
Net increase (decrease) in net asset value | 2.80 | (0.09) | (10.14) | 3.95
Net asset value, end of period | $ 10.77 | $ 19.13 | $ 10.77 | $ 19.13
Total Return | 35.13% | (0.47%) | (48.49%) | 26.02%
Ratios to Average Net Assets |  |  |  |
Total income (loss) | 41.99% | 0.26% | 28.07% | 22.16%
Management fees | 0.75% | 0.75% | 0.75% | 0.75%
Total expenses excluding management fees | 0.43% | 0.16% | 0.43% | 0.17%
Expense waived | (0.27%) | 0.01% | (0.27%) | (0.02%)
Net expense excluding management fees | 0.16% | 0.17% | 0.16% | 0.15%
Net income (loss) | 41.77% | 0.04% | (27.62%) | 21.72%

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