Note 8 - Financial Highlights (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

Financial Highlights [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Net asset value per Share, beginning of period	$	12.40		$	12.71		$	12.28		$	12.45
Net investment loss(a)		(0.01	)		(0.01	)		(0.02	)		(0.02	)
Net realized and unrealized gain(b)		1.09			(0.70	)		1.22			(0.43	)
Net increase (decrease) in net assets from operations		1.08			(0.71	)		1.20			(0.45	)
Net asset value per Share, end of period	$	13.48		$	12.00		$	13.48		$	12.00
Total return, at net asset value(c) (d)		8.71	%		(5.59	)%		9.77	%		(3.61	)%
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	%