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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Per Share Operating Performance:        
Net asset value, beginning of period $ 7.97 $ 19.22 $ 20.91 $ 15.18
Total income (loss) 2.82 (0.05) (10.10) 4.03
Total expenses (0.02) (0.04) (0.04) (0.08)
Net increase (decrease) in net asset value 2.80 (0.09) (10.14) 3.95
Net asset value, end of period $ 10.77 $ 19.13 $ 10.77 $ 19.13
Total Return 35.13% (0.47%) (48.49%) 26.02%
Ratios to Average Net Assets        
Total income (loss) 41.99% 0.26% 28.07% 22.16%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.43% 0.16% 0.43% 0.17%
Expense waived (0.27%) 0.01% (0.27%) (0.02%)
Net expense excluding management fees 0.16% 0.17% 0.16% 0.15%
Net income (loss) 41.77% 0.04% (27.62%) 21.72%