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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Per Share Operating Performance:      
Net asset value, beginning of year $ 11.65 $ 7.74 $ 8.43
Total income (loss) 5.78 4.01 (0.62)
Total expenses (0.19) (0.10) (0.07)
Net increase (decrease) in net asset value 5.59 3.91 (0.69)
Net asset value, end of year $ 17.24 $ 11.65 $ 7.74
Total Return 47.98% 50.52% (8.19%)
Ratios to Average Net Assets      
Total income (loss) 11.13% 28.53% (3.59%)
Management fees 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.61% 1.28% 1.41%
Expense waived (0.46%) (1.13%) (1.26%)
Net expense excluding management fees 0.15% 0.15% 0.15%
Net income (loss) 10.23% 27.63% (4.49%)