v3.26.1
Financial Highlights Per Share Performance - Summary of Per Share Data (Details) - $ / shares
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Per Share Data    
Principal Market NAV, beginning of period $ 68.41 $ 74.08
Net decrease in net assets from investment operations:    
Net investment loss (0.22) (0.27)
Net realized and unrealized loss (15.4) (8.66)
Net decrease in net assets resulting from operations (15.62) (8.93)
Principal Market NAV, end of period $ 52.79 $ 65.15
Total return (22.83%) (12.05%)
Ratios to average net assets:    
Net investment loss (1.50%) (1.50%)
Expenses (1.50%) (1.50%)