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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Per Share Operating Performance:    
Net asset value, beginning of period $ 102.27 [1] $ 76.68
Total income (loss) (68.18) 23.50
Total expenses (0.15) (0.18)
Net increase (decrease) in net asset value (68.33) 23.32
Net asset value, end of period $ 33.94 [1] $ 100.00
Total Return (66.82%) 30.34%
Ratios to Average Net Assets    
Total income (loss) (108.82%) 26.09%
Management fees 0.45% 0.45%
Expenses excluding management fees 0.46% 0.34%
Net income (loss) (109.05%) 25.90%
[1] On April 28, 2020 there was a 1-for-8 reverse share split. The Statement of Operations have been adjusted for the periods shown to reflect the 1-for-8 reverse share split on a retroactive basis.