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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 year $ 7.74 $ 8.43 $ 10.26
Total income (loss) 4.01 (0.62) (1.74)
Total expenses (0.10) (0.07) (0.09)
Net increase (decrease) in net asset value 3.91 (0.69) (1.83)
Net asset value, end of year $ 11.65 $ 7.74 $ 8.43
Total Return 50.52% (8.19%) (17.84%)
Ratios to Average Net Assets      
Total income (loss) 28.53% (3.59%) (17.87%)
Management fees 0.75% 0.75% 0.75%
Total expenses excluding management fees 1.28% 1.41% 1.86%
Expense waived (1.13%) (1.26%) (1.71%)
Net expense excluding management fees 0.15% 0.15% 0.15%
Net income (loss) 27.63% (4.49%) (18.77%)