Note 8 - Financial Highlights (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

Financial Highlights [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net asset value per Share, beginning of period	$	12.73		$	11.32		$	10.25		$	11.61
Net investment loss (a)		(0.01	)		(0.01	)		(0.02	)		(0.02	)
Net realized and unrealized gain (loss) (b)		0.02			(0.55	)		2.51			(0.83	)
Net increase (decrease) in net assets from operations		0.01			(0.56	)		2.49			(0.85	)
Net asset value per Share, end of period	$	12.74		$	10.76		$	12.74		$	10.76
Total return, at net asset value (c)(d)		0.08	%		(4.95	) %		24.29	%		(7.32	) %
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	%