Note 8 - Financial Highlights (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

Financial Highlights [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Net asset value per Share, beginning of period	$	11.93		$	11.48		$	10.25		$	11.61
Net investment loss (a)		(0.01	)		(0.01	)		(0.01	)		(0.01	)
Net realized and unrealized gain (loss) (b)		0.81			(0.15	)		2.49			(0.28	)
Net increase (decrease) in net assets from operations		0.80			(0.16	)		2.48			(0.29	)
Net asset value per Share, end of period	$	12.73		$	11.32		$	12.73		$	11.32
Total return, at net asset value (c)(d)		6.71	%		(1.39	) %		24.20	%		(2.50	) %
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	%