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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Per Share Operating Performance:        
Net asset value, beginning of period $ 7.89 $ 7.63 $ 7.74 $ 8.43
Total income (loss) 2.11 (0.06) 2.28 (0.84)
Total expenses (0.02) (0.02) (0.04) (0.04)
Net increase (decrease) in net asset value 2.09 (0.08) 2.24 (0.88)
Net asset value, end of period $ 9.98 $ 7.55 $ 9.98 $ 7.55
Total Return 26.49% (1.05%) 28.94% (10.44%)
Ratios to Average Net Assets        
Total income (loss) 24.18% (2.25%) 27.32% (11.90%)
Management fees 0.75% 0.75% 0.75% 0.75%
Total Expenses excluding management fees 1.90% 2.21% 1.81% 2.22%
Expense waived (1.75%) (2.01%) (1.66%) (2.04%)
Net expense excluding management fees 0.15% 0.20% 0.15% 0.18%
Net income (loss) 23.96% (2.49%) 26.87% (12.36%)