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	$	13.99		$	16.32		$	15.62
Net investment income (loss)(a)		0.21			0.15			(0.00	)(b)
Net realized and unrealized gain (loss)(c)		2.04			(2.48	)		0.70
Net increase (decrease) in net assets from operations		2.25			(2.33	)		0.70
Net asset value per Share, end of year	$	16.24		$	13.99		$	16.32
Total return, at net asset value(d)		16.08	%		(14.28	)%		4.48	%
Ratio to average net assets:
Net investment income (loss)		1.33	%		0.90	%		(0.01	)%
Expenses		0.85	%		0.85	%		0.87	%