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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Per Share Operating Performance:      
Net asset value, beginning of period $ 8.43 $ 10.26 $ 9.26
Total income (loss) (0.62) (1.74) 1.09
Total expenses (0.07) (0.09) (0.09)
Net increase (decrease) in net asset value (0.69) (1.83) 1.00
Net asset value, end of period $ 7.74 $ 8.43 $ 10.26
Total Return (8.19%) (17.84%) 10.80%
Ratios to Average Net Assets      
Total income (loss) (3.59%) (17.87%) 9.73%
Management fees 0.75% 0.75% 0.75%
Total Expenses excluding management fees 1.41% 1.86% 1.08%
Expenses waived (1.26%) (1.71%) (0.93%)
Net expenses excluding management fees 0.15% 0.15% 0.15%
Net income (loss) (4.49%) (18.77%) 8.83%