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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 year $ 15.18 $ 18.18
Total income (loss) 3.04 5.24
Net expenses (0.13) (0.14)
Net increase (decrease) in net asset value 2.91 5.10
Net asset value, end of year $ 18.09 $ 23.28
Total Return 19.17% 28.05%
Ratios to Average Net Assets    
Total income (loss) 17.44% 24.86%
Management fees 0.75% 0.75%
Total expenses excluding management fees 0.22% 0.26%
Expenses waived (0.07%) (0.11%)
Net expenses excluding management fees 0.15% 0.15%
Net income (loss) 16.77% 24.18%