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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 $ 7.55 $ 9.11 $ 8.43 $ 10.26
Total income (loss) 1.04 (0.25) 0.19 (1.35)
Total expenses (0.02) (0.02) (0.05) (0.07)
Net increase (decrease) in net asset value 1.02 (0.27) 0.14 (1.42)
Net asset value, end of period $ 8.57 $ 8.84 $ 8.57 $ 8.84
Total Return 13.51% (2.96%) 1.66% (13.84%)
Ratios to Average Net Assets        
Total income (loss) 12.67% (2.76%) 9.08% (13.48%)
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 1.02% 1.73% 1.64% 1.89%
Expenses waived (0.90%) (1.58%) (1.49%) (1.74%)
Net expenses excluding management fees 0.12% 0.15% 0.15% 0.15%
Net income (loss) 12.45% (2.99%) 8.40% (14.15%)