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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Per Share Operating Performance:      
Net asset value, beginning of period $ 17.23 $ 22.95 $ 17.82
Total income (loss) 10.79 (5.59) 5.32
Total expenses (0.21) (0.13) (0.19)
Net increase (decrease) in net asset value 10.58 (5.72) 5.13
Net asset value, end of period $ 27.81 $ 17.23 $ 22.95
Total Return 61.40% (24.92%) 28.79%
Ratios to Average Net Assets      
Total income (loss) 53.01% 61.24% 26.56%
Management fees 0.60% 0.60% 0.60%
Total expenses excluding management fees 0.30% 0.28% 0.28%
Net income (loss) 52.11% 60.36% 25.68%