Note 8 - Financial Highlights (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Financial Highlights [Table Text Block]

	December 31,
	2023			2022			2021(a)
Net asset value per Share, beginning of year	$	34.38		$	34.62		$	36.06
Net investment loss(b)		(0.09	)		(0.09	)		(0.09	)
Net realized and unrealized gain (loss)(c)		4.74			(0.15	)		(1.35	)
Net increase (decrease) in net assets from operations		4.65			(0.24	)		(1.44	)
Net asset value per Share, end of year	$	39.03		$	34.38		$	34.62
Total return, at net asset value(d)		13.53	%		(0.69	)%		(3.99	)%
Ratio to average net assets:
Net investment loss		(0.25	)%		(0.25	)%		(0.25	)%
Expenses		0.25	%		0.25	%		0.25	%