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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 $ 27.81 $ 17.23 $ 22.95
Total income (loss) 7.95 10.79 (5.59)
Total expenses (0.31) (0.21) (0.13)
Net increase (decrease) in net asset value 7.64 10.58 (5.72)
Net asset value, end of year $ 35.45 $ 27.81 $ 17.23
Total Return 27.47% 61.40% (24.92%)
Ratios to Average Net Assets      
Total income (loss) 31.17% 53.01% 61.24%
Management fees 0.60% 0.60% 0.60%
Total expenses excluding management fees 0.25% 0.30% 0.28%
Net income (loss) 30.32% 52.11% 60.36%