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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 $ 12.39 $ 9.20 $ 9.20
Total income (loss) 2.06 3.33 (7.55)
Total expenses (0.23) (0.14) (0.16)
Net increase (decrease) in net asset value 1.83 3.19 (7.71)
Net asset value, end of year $ 14.22 $ 12.39 $ 9.20
Total Return 14.77% 34.67% (45.59%)
Ratios to Average Net Assets      
Total income (loss) 17.00% 6.56% (49.07%)
Management fees 0.60% 0.60% 0.60%
Total expenses excluding management fees 0.46% 0.51% 0.75%
Net income (loss) 15.94% 5.45% (50.42%)