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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 year $ 15.84 $ 7.97 $ 12.91 $ 20.91
Total income (loss) 3.45 2.82 6.41 (10.10)
Total expenses (0.05) (0.02) (0.08) (0.04)
Net increase (decrease) in net asset value 3.40 2.80 6.33 (10.14)
Net asset value, end of year $ 19.24 $ 10.77 $ 19.24 $ 10.77
Total Return 21.46% 35.13% 49.03% (48.49%)
Ratios to Average Net Assets        
Total income (loss) 19.73% 41.99% 41.40% 28.07%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.39% 0.43% 0.34% 0.43%
Expenses waived (0.08%) (0.27%) (0.12%) (0.27%)
Net expense excluding management fees 0.31% 0.16% 0.22% 0.16%
Net income (loss) 19.47% 41.77% 40.92% 27.62%