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FINANCIAL HIGHLIGHTS (Details)
 12 Months Ended
Apr. 28, 2020
Apr. 08, 2020
Dec. 31, 2021
$ / shares
Dec. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Per Share Operating Performance:          
Net asset value, beginning of year [1]     $ 33.07 $ 102.27 $ 76.68
Total income (loss)     21.48 (68.95) [1] 26.34 [1]
Total expenses     (0.37) (0.25) [1] (0.75) [1]
Net increase (decrease) in net asset value     21.11 (69.20) [1] 25.59 [1]
Net asset value, end of year [1]     $ 54.18 $ 33.07 $ 102.27
Total Return     63.83% (67.66%) [1] 33.37% [1]
Ratios to Average Net Assets          
Total income (loss)     54.68% (54.88%) [1] 33.77% [1]
Management fees     0.45% 0.45% [1] 0.45% [1]
Total expenses excluding management fees     0.36% 0.38% [1] 0.34% [1]
Net income (loss)     53.87% (55.71%) [1] 32.97% [1]
Stockholders' Equity Note, Stock Split, Conversion Ratio 0.125 0.125      
Conversion ratio 0.125 0.125      
[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.