Note 8 - Financial Highlights (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Financial Highlights [Table Text Block]

	December 31,
	2020			2019			2018
Net asset value per Share, beginning of year	$	14.56		$	12.28		$	12.45
Net investment loss(a)		(0.04	)		(0.03	)		(0.03	)
Net realized and unrealized gain (loss)(b)		3.51			2.31			(0.14	)
Net increase (decrease) in net assets from operations		3.47			2.28			(0.17	)
Net asset value per Share, end of year	$	18.03		$	14.56		$	12.28
Total return, at net asset value(c)		23.83	%		18.57	%		(1.37	)%
Ratio to average net assets:
Net investment loss		(0.25	)%		(0.25	)%		(0.25	)%
Expenses		0.25	%		0.25	%		0.25	%