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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Per Share Operating Performance:        
Net asset value, beginning of period $ 14.70 $ 21.80 $ 22.95 $ 17.82
Total income (loss) 0.45 (1.59) (7.74) 2.48
Total expenses (0.04) (0.05) (0.10) (0.14)
Net increase (decrease) in net asset value 0.41 (1.64) (7.84) 2.34
Net asset value, end of period $ 15.11 $ 20.16 $ 15.11 $ 20.16
Total Return 2.79% (7.52%) (34.16%) 13.13%
Ratios to Average Net Assets        
Total income (loss) 4.15% (7.69%) 48.46% 13.77%
Management fees [1] 0.60% 0.60% 0.60% 0.60%
Expenses excluding management fees [1] 0.30% 0.26% 0.30% 0.29%
Net income (loss) 3.92% (7.90%) 47.79% 13.10%
[1] Annualized.