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FINANCIAL HIGHLIGHTS (Details) - $ / shares | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Per Share Operating Performance: |  |
Net asset value, beginning of year | $ 15.18 | $ 18.18
Total income (loss) | 3.04 | 5.24
Net expenses | (0.13) | (0.14)
Net increase (decrease) in net asset value | 2.91 | 5.10
Net asset value, end of year | $ 18.09 | $ 23.28
Total Return | 19.17% | 28.05%
Ratios to Average Net Assets |  |
Total income (loss) | 17.44% | 24.86%
Management fees | 0.75% | 0.75%
Total expenses excluding management fees | 0.22% | 0.26%
Expenses waived | (0.07%) | (0.11%)
Net expenses excluding management fees | 0.15% | 0.15%
Net income (loss) | 16.77% | 24.18%

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