Note 8 - Financial Highlights (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Financial Highlights [Table Text Block]

	December 31,
	2019			2018			2017
Net asset value per Share, beginning of year	$	12.28		$	12.45		$	11.16
Net investment loss(a)		(0.03	)		(0.03	)		(0.03	)
Net realized and unrealized gain (loss)(b)		2.31			(0.14	)		1.32
Net increase (decrease) in net assets from operations		2.28			(0.17	)		1.29
Net asset value per Share, end of year	$	14.56		$	12.28		$	12.45
Total return, at net asset value(c)		18.57	%		(1.37	)%		11.56	%
Ratio to average net assets:
Net investment loss		(0.25	)%		(0.25	)%		(0.25	)%
Expenses		0.25	%		0.25	%		0.25	%