Note 8 - Financial Highlights (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Financial Highlights [Table Text Block]

	Three Months Ended
	March 31,
	2019			2018
Net asset value per Share, beginning of period	$	12.28		$	12.45
Net investment loss (a)		(0.01	)		(0.01	)
Net realized and unrealized gain (b)		0.13			0.27
Net increase in net assets from operations		0.12			0.26
Net asset value per Share, end of period	$	12.40		$	12.71
Total return, at net asset value (c)(d)		0.98	%		2.09	%
Ratio to average net assets:
Net investment loss (e)		(0.25	)%		(0.25	)%
Expenses (e)		0.25	%		0.25	%