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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Per Share Operating Performance:    
Net asset value, beginning of period $ 8.43 $ 10.26
Total income (loss) (0.78) 0.26
Net expenses (0.02) (0.02)
Net increase (decrease) in net asset value (0.80) 0.24
Net asset value, end of period $ 7.63 $ 10.50
Total Return (9.49%) 2.34%
Ratios to Average Net Assets    
Total income (loss) (10.16%) 2.52%
Management fees 0.75% 0.75%
Total expenses excluding management fees 2.22% 1.88%
Expenses waived (2.07%) (1.73%)
Net expenses excluding management fees 0.15% 0.15%
Net income (loss) (10.39%) 2.30%