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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Per Share Operating Performance:        
Net asset value, beginning of period $ 25.61 $ 14.70 $ 17.23 $ 22.95
Total income (loss) 1.55 0.45 10.02 (7.74)
Total expenses (0.06) (0.04) (0.15) (0.10)
Net increase (decrease) in net asset value 1.49 0.41 9.87 (7.84)
Net asset value, end of period $ 27.10 $ 15.11 $ 27.10 $ 15.11
Total Return 5.82% 2.79% 57.28% (34.16%)
Ratios to Average Net Assets        
Total income (loss) 4.62% 4.15% 47.37% 48.46%
Management fees [1] 0.60% 0.60% 0.60% 0.60%
Total expenses excluding management fees [1] 0.31% 0.30% 0.30% 0.30%
Net income (loss) 4.39% 3.92% 46.70% 47.79%
[1] Annualized.