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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Per Share Operating Performance:    
Net asset value, beginning of period [1] $ 33.07 $ 102.27
Total income (loss) [1] 7.40 (68.18)
Total expenses [1] (0.07) (0.15)
Net increase (decrease) in net asset value [1] 7.33 (68.33)
Net asset value, end of period [1] $ 40.40 $ 33.94
Total Return [1] 22.17% (66.82%)
Ratios to Average Net Assets    
Total income (loss) [1] 21.18% (108.82%)
Management fees [1],[2] 0.45% 0.45%
Total expenses excluding management fees [1] 0.31% 0.46%
Net income (loss) [1] 20.99% (109.05%)
[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] Annualized.