Note 8 - Financial Highlights (Details) - Financial Highlights (USD $)	3 Months Ended
	Mar. 31, 2014
FinancialHighlightsAbstract
Net asset value per Share, beginning of period	$ 11.66
Net increase in net assets from operations	$ 0.86
Net asset value per Share, end of period	$ 12.52	[1]
Total return, at net asset value(b)	7.38%	[2]
Ratio to average net assets:
Net investment loss(c)	(0.25%)	[3]
Expenses(c)	0.25%	[3]
Net investment loss(a)	$ (0.01)	[4]
Net realized and unrealized gain(a)	$ 0.87	[4]

[1] Effective January 1, 2014, the Trust qualifies as an investment company for accounting purposes. Disclosure of net asset value per Share is required for investment companies. Please refer to Note 2B.

[2] Based on the change in net asset value of a Share during the period. Percentage is not annualized.

[3] Percentage is annualized.

[4] Based on average Shares outstanding during the period.