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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Per Share Operating Performance:    
Net asset value, beginning of period $ 7.74  
Total income (loss) 0.17 $ (0.78)
Total expenses (0.02) (0.02)
Net increase (decrease) in net asset value 0.15 (0.80)
Net asset value, end of period $ 7.89 $ 7.63
Total Return 1.94% (9.49%)
Ratios to Average Net Assets    
Total income (loss) 1.49% (10.16%)
Management fees 0.75% 0.75%
Total Expenses excluding management fees 1.70% 2.22%
Expense waived (1.55%) (2.07%)
Net expense excluding management fees 0.15% 0.15%
Net income (loss) 1.27% (10.39%)