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Financial Highlights Per Share Performance - Summary of per share data (Detail) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Per Share Data      
Principal Market net asset value, beginning of year $ 15.11 $ 42.72 $ 27.73
Net increase (decrease) in net assets from investment operations:      
Net investment loss (0.52) (0.52) (0.89)
Net realized and unrealized gain (loss) 23.47 (27.09) 15.88
Net increase (decrease) in net assets resulting from operations 22.95 (27.61) 14.99
Principal Market net asset value, end of year $ 38.06 $ 15.11 $ 42.72
Total return 151.89% (64.63%) 54.06%
Ratios to average net assets:      
Net investment loss (2.00%) (2.00%) (2.00%)
Expenses (2.00%) (2.00%) (2.00%)