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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%)

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