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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
 [1]
Jun. 30, 2020
Jun. 30, 2019
Per Share Operating Performance:        
Net asset value, beginning of period $ 33.94 $ 100.00 $ 102.27 [2] $ 76.68
Total income (loss) (5.86) (2.74) (74.10) 24.55
Total expenses (0.06) (0.20) (0.15) (0.37)
Net increase (decrease) in net asset value (5.92) (2.94) (74.25) 20.38
Net asset value, end of period $ 28.02 $ 97.06 $ 28.02 $ 97.06 [1]
Total Return (17.44%) (2.94%) (72.60%) 26.49%
Ratios to Average Net Assets        
Total income (loss) (22.14%) (1.53%) (90.01%) 25.81%
Management fees [3] 0.45% 0.45% 0.45% 0.45%
Expenses excluding management fees [3] 0.55% 0.34% 0.53% 0.34%
Net income (loss) (22.39%) (1.72%) 90.49% 25.42%
[1] On April 28, 2020, there was a 1-for-8 reverse share split. The Financial Highlights have been adjusted for the period shown to reflect the 1-for-8 reverse share split on retroactive basis.
[2] On April 28, 2020, there was a 1-for-8 reverse share split. The Condensed Statement of Financial Conditions have been adjusted for the periods shown  to reflect the 1-for-8 reverse share split on retroactive basis.
[3] Annualized.