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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Per Share Operating Performance:    
Net asset value, beginning of period at December 31, 2018 $ 17.82 $ 21.05
Total income (loss) 2.48 6.23
Total expenses (0.14) (0.14)
Net increase (decrease) in net asset value 2.34 6.09
Net asset value, end of period at September 30, 2019 $ 20.16 $ 27.14
Total Return 13.13% 28.93%
Ratios to Average Net Assets    
Total income (loss) 13.77% 26.11%
Management fees [1] 0.60% 0.60%
Expenses excluding management fees [1] 0.29% 0.21%
Net income (loss) 13.10% 25.50%
[1] Annualized.