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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 $ 49.87 $ 28.02 $ 33.07 $ 102.27
Total income (loss) 2.88 0.52 19.85 (73.59)
Total expenses (0.10) (0.05) (0.27) (0.19)
Net increase (decrease) in net asset value 2.78 0.47 19.58 (73.78)
Net asset value, end of period $ 52.65 $ 28.49 $ 52.65 $ 28.49
Total Return 5.57% 1.68% 59.21% (72.14%)
Ratios to Average Net Assets        
Total income (loss) 5.06% 2.12% 49.45% (73.46%)
Management fees 0.45% 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.36% 0.26% 0.36% 0.41%
Net income (loss) 4.86% 1.94% 48.84% (74.11%)