Selected Quarterly Information (Unaudited) - Summary of Selected Quarterly Information (Unaudited) (Detail) - USD ($)	3 Months Ended	12 Months Ended
Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Income
Interest Income	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0			$ 21,021
Total Income	0	0	0	0	0	0	0	0			21,021
Expenses
Sponsor's fee	(244,124)	(270,088)	(273,639)	(456,814)	(275,425)	(372,505)	(227,325)	(194,116)	$ (1,244,665)	$ (1,069,371)	(859,746)
Interest Expense	(253,168)	(278,025)	(241,325)	(231,923)	(137,315)	(189,707)	(92,070)	(17,009)	(1,004,441)	(436,101)	(2,522)
Total Expenses	(497,292)	(548,113)	(514,964)	(688,737)	(412,740)	(562,212)	(319,395)	(211,125)	(2,249,106)	(1,505,472)	(862,268)
Net Loss	$ (497,292)	$ (548,113)	$ (514,964)	$ (688,737)	$ (412,740)	$ (562,212)	$ (319,395)	$ (211,125)	$ (2,249,106)	$ (1,505,472)	$ (841,247)
Basic and Diluted Earnings per Share	$ (0.22)	$ (0.22)	$ (0.20)	$ (0.16)	$ (0.17)	$ (0.17)	$ (0.15)	$ (0.13)	$ (0.78)	$ (0.62)	$ (0.52)
Weighted-average Shares Outstanding	2,217,391	2,473,913	2,535,556	4,277,717	2,497,826	3,376,630	2,183,708	1,611,957	2,878,005	2,419,452	1,616,438
Cash Dividends per Share	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Other Comprehensive Income/(Loss):
Currency translation adjustment	$ 8,253	$ 904	$ (12,031)	$ 414	$ 5,512	$ 4,067	$ (6,441)	$ 14,749	$ (2,460)	$ 17,887	$ 11,364
Total Comprehensive Loss	$ (489,039)	$ (547,209)	$ (526,995)	$ (688,323)	$ (407,228)	$ (558,145)	$ (325,836)	$ (196,376)	$ (2,251,566)	$ (1,487,585)	$ (829,883)

Aggregate dividends paid during the period for each share of common stock outstanding.

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