Note 8 - Financial Highlights (Details) - Financial Highlights (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014		Jun. 30, 2014
FinancialHighlightsAbstract
Net asset value per Share, beginning of period	$ 12.52		$ 11.66
Net increase in net assets from operations	$ 0.22		$ 1.08
Net asset value per Share, end of period	$ 12.74	[1]	$ 12.74	[1]
Total return, at net asset value(c)	1.76%	[2]	9.26%	[2]
Ratio to average net assets:
Net investment loss(d)	(0.25%)	[3]	(0.25%)	[3]
Expenses(d)	0.25%	[3]	0.25%	[3]
Net investment loss(a)	$ (0.01)	[4]	$ (0.02)	[4]
Net realized and unrealized gain(b)	$ 0.23	[5]	$ 1.10	[5]

[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.

[5] The amounts reported for a Share outstanding may not accord with the change in aggregate gains and losses on investment for the period due to the timing of Trust Share transactions in relation to the fluctuating fair values of the Trust's underlying investment.