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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Per Share Operating Performance:      
Net asset value, beginning of year $ 15.18 $ 18.18 $ 15.70
Total income (loss) 5.90 (2.82) 2.61
Net expenses (0.17) (0.18) (0.13)
Net increase (decrease) in net asset value 5.73 (3.00) 2.48
Net asset value, end of year $ 20.91 $ 15.18 $ 18.18
Total Return 37.75% (16.50%) 15.80%
Ratios to Average Net Assets      
Total income (loss) 31.50% (14.88%) 16.22%
Management fees 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.24% 0.23% 0.48%
Expenses waived (0.09%) (0.08%) (0.33%)
Net expenses excluding management fees 0.15% 0.15% 0.15%
Net income (loss) 30.60% (15.78%) 15.32%