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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 $ 12.16 $ 22.52 $ 22.95 $ 17.82
Total income (loss) 2.57 (0.67) (8.19) 4.08
Total expenses (0.03) (0.05) (0.06) (0.10)
Net increase (decrease) in net asset value 2.54 (0.72) (8.25) 3.98
Net asset value, end of period $ 14.70 $ 21.80 $ 14.70 $ 21.80
Total Return 20.89% (3.20%) (35.95%) 22.33%
Ratios to Average Net Assets        
Total income (loss) 43.12% (2.75%) 53.68% 20.09%
Management fees [1] 0.60% 0.60% 0.60% 0.60%
Expenses excluding management fees [1] 0.30% 0.31% 0.30% 0.31%
Net income (loss) 42.90% (2.97%) (53.23%) 19.64%
[1] Annualized.