Note 8 - Financial Highlights (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

Financial Highlights [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Net asset value per Share, beginning of period	$	12.00		$	11.95		$	12.45		$	11.16
Net investment loss (a)		(0.01	)		(0.01	)		(0.02	)		(0.02	)
Net realized and unrealized gain (loss) (b)		(0.61	)		0.39			(1.05	)		1.19
Net increase (decrease) in net assets from operations		(0.62	)		0.38			(1.07	)		1.17
Net asset value per Share, end of period	$	11.38		$	12.33		$	11.38		$	12.33
Total return, at net asset value (c)(d)		(5.17	%)		3.18	%		(8.59	%)		10.48	%
Ratio to average net assets:
Net investment loss (e)		(0.25	%)		(0.25	%)		(0.25	%)		(0.25	%)
Expenses (e)		0.25	%		0.25	%		0.25	%		0.25	%