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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Per Share Operating Performance:        
Net asset value, beginning of year $ 7.01 $ 19.69 $ 14.22 $ 12.39
Total income (loss) 0.47 (1.18) (6.72) 6.16
Total expenses (0.02) (0.06) (0.04) (0.10)
Net increase (decrease) in net asset value 0.45 (1.24) (6.76) 6.06
Net asset value, end of year $ 7.46 $ 18.45 $ 7.46 $ 18.45
Total Return 6.42% (6.30%) (47.54%) 48.91%
Ratios to Average Net Assets        
Total income (loss) 9.90% (10.84%) (32.62%) 37.08%
Management fees [1] 0.60% 0.60% 0.60% 0.60%
Total expenses excluding management fees [1] 0.41% 0.41% 0.47% 0.41%
Net income (loss) 9.65% (11.09%) (33.15%) 36.58%
[1] #    Annualized.