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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Per Share Operating Performance:      
Net asset value, beginning of period [1] $ 102.27 [2] $ 76.68 $ 96.63
Total income (loss) (68.95) 26.34 [1] (19.18) [1]
Total expenses (0.25) (0.75) [1] (0.77) [1]
Net increase (decrease) in net asset value (69.20) 25.59 [1] (19.95) [1]
Net asset value, end of period [1] $ 33.07 $ 102.27 [2] $ 76.68
Total Return (67.66%) 33.37% [1] (20.65%) [1]
Ratios to Average Net Assets      
Total income (loss) (54.88%) 33.77% [1] (15.36%) [1]
Management fees 0.45% 0.45% [1] 0.45% [1]
Expenses excluding management fees 0.38% 0.34% [1] 0.28% [1]
Net income (loss) (55.71%) 32.97% [1] (16.09%) [1]
[1] On April 28, 2020, there was a 1-for-8 reverse share split. The Financial Highlights have been adjusted for the periods shown to reflect the 1-for-8 reverse share split on a retroactive basis.
[2] On April 28, 2020, there was a 1-for-8 reverse share split. The Statements of Financial Condition have been adjusted for the periods shown to reflect the 1-for-8 reverse share split on a retroactive basis