Financial Highlights Per Share Performance - Summary of Per Share Data (Details) - $ / shares	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Per Share Data:
Principal Market NAV, beginning of year	$ 3.34	$ 2.64	$ 0.9
Net increase in net assets from investment operations:
Net investment loss	(0.08)	(0.07)	(0.03)
Net realized and unrealized gain	1.05	0.77	1.77
Net increase in net assets resulting from operations	0.97	0.7	1.74
Principal Market NAV, end of year	$ 4.31	$ 3.34	$ 2.64
Total return	29.04%	26.52%	193.33%
Ratios to average net assets:
Net investment loss	(2.50%)	(2.50%)	(2.50%)
Expenses	(2.50%)	(2.50%)	(2.50%)