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	$	14.52		$	15.91		$	15.40
Net investment loss(a)		(0.08	)		(0.07	)		(0.08	)
Net realized and unrealized gain (loss)(b)		2.41			(1.32	)		0.59
Net increase (decrease) in net assets from operations		2.33			(1.39	)		0.51
Net asset value per Share, end of year	$	16.85		$	14.52		$	15.91
Total return, at net asset value(c)		16.05	%		(8.74	)%		3.31	%
Ratio to average net assets:
Net investment loss		(0.50	)%		(0.50	)%		(0.50	)%
Expenses		0.50	%		0.50	%		0.50	%