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	$	14.16		$	15.34		$	14.52		$	15.91
Net investment loss(a)		(0.02	)		(0.02	)		(0.04	)		(0.04	)
Net realized and unrealized gain (loss)(b)		0.11			(0.24	)		(0.23	)		(0.79	)
Net increase (decrease) in net assets from operations		0.09			(0.26	)		(0.27	)		(0.83	)
Net asset value per Share, end of period	$	14.25		$	15.08		$	14.25		$	15.08
Total return, at net asset value(c)(d)		0.64	%		(1.69	)%		(1.86	)%		(5.22	)%
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	%