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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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Percentage, after deduction of fee waiver and incentive fee, of expense to average net assets.

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