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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Per Share Operating Performance:      
Net asset value, beginning of year $ 54.18 $ 33.07 $ 102.27
Total income (loss) 16.31 21.48 (68.95)
Total expenses (0.44) (0.37) (0.25)
Net increase (decrease) in net asset value 15.87 21.11 (69.20)
Net asset value, end of year $ 70.05 $ 54.18 $ 33.07
Total Return 29.29% 63.83% (67.66%)
Ratios to Average Net Assets      
Total income (loss) 31.22% 54.68% (54.88%)
Management fees 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.15% 0.36% 0.38%
Net income (loss) 30.61% 53.87% (55.71%)