v3.26.1
Financial Highlights Per Share Performance - Summary of Per Share Data (Detail) - $ / shares
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Per Share Data:    
Principal Market NAV, beginning of period $ 9 $ 20.23
Net decrease in net assets from investment operations:    
Net investment loss (0.05) (0.11)
Net realized and unrealized loss (2.56) (6.65)
Net decrease in net assets resulting from operations (2.61) (6.76)
Principal Market NAV, end of period $ 6.39 $ 13.47
Total return (29.00%) (33.42%)
Ratios to average net assets:    
Net investment loss (2.50%) (2.50%)
Expenses (2.50%) (2.50%)