Note 8 - Financial Highlights (Tables)

9 Months Ended

Sep. 30, 2015

Financial Highlights [Abstract]

Financial Highlights [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Net asset value per Share, beginning of period	$	15.00		$	20.04		$	15.29		$	18.77
Net investment loss(a)		(0.02	)		(0.02	)		(0.06	)		(0.07	)
Net realized and unrealized loss(b)		(1.00	)		(3.61	)		(1.25	)		(2.29	)
Net decrease in net assets from operations		(1.02	)		(3.63	)		(1.31	)		(2.36	)
Net asset value per Share, end of period	$	13.98		$	16.41		$	13.98		$	16.41
Total return(c)(d)		(6.80	)%		(18.11	)%		(8.57	)%		(12.57	)%
Ratio to average net assets:
Net investment loss(e)		(0.50	)%		(0.50	)%		(0.50	)%		(0.50	)%
Expenses(e)		0.50	%		0.50	%		0.50	%		0.50	%