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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 year $ 12.91 $ 20.91
Total income (loss) 2.96 (12.91)
Total expenses (0.03) (0.03)
Net increase (decrease) in net asset value 2.93 (12.94)
Net asset value, end of year $ 15.84 $ 7.97
Total Return 22.70% (61.88%)
Ratios to Average Net Assets    
Total income (loss) 21.56% (95.57%)
Management fees 0.75% 0.75%
Total expenses excluding management fees 0.31% 0.43%
Expenses waived (0.16%) (0.28%)
Net expense excluding management fees 0.15% 0.15%
Net income (loss) 21.34% (95.80%)