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Selected Quarterly Information (Unaudited) - Schedule of Quarterly Financial Information (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	$ 458,540	$ 627,072	$ 692,867	$ 797,805	$ 723,635	$ 863,605	$ 946,190	$ 1,516,849	$ 2,576,284	$ 4,050,279	$ 6,879,609
Total Income	458,540	627,072	692,867	797,805	723,635	863,605	946,190	1,516,849	2,576,284	4,050,279	6,879,609
Expenses
Sponsor's fee	(179,966)	(174,819)	(175,173)	(183,859)	(180,109)	(196,856)	(197,321)	(261,853)	(713,817)	(836,139)	(1,255,968)
Total Expenses	(179,966)	(174,819)	(175,173)	(183,859)	(180,109)	(196,856)	(197,321)	(261,853)	(713,817)	(836,139)	(1,255,968)
Net Income	$ 278,574	$ 452,253	$ 517,694	$ 613,946	$ 543,526	$ 666,749	$ 748,869	$ 1,254,996	$ 1,862,467	$ 3,214,140	$ 5,623,641
Basic and Diluted Earnings per Share	$ 0.12	$ 0.19	$ 0.22	$ 0.24	$ 0.22	$ 0.26	$ 0.29	$ 0.41	$ 0.77	$ 1.20	$ 1.64
Weighted-average Shares Outstanding	2,351,087	2,345,109	2,388,333	2,551,087	2,479,891	2,516,304	2,578,090	3,092,391	2,409,016	2,667,397	3,420,137
Cash Dividends per Share	$ 0.15	$ 0.20	$ 0.23	$ 0.24	$ 0.23	$ 0.27	$ 0.33	$ 0.40	$ 0.81	$ 1.25	$ 1.65
Other Comprehensive (Loss)/Income:
Currency translation adjustment	$ 18	$ 11,377	$ 13,754	$ (5,633)	$ (4,195)	$ (28,132)	$ 13,385	$ (80,040)	$ 19,516	$ (98,982)	$ (78,613)
Total Comprehensive Income	$ 278,592	$ 463,630	$ 531,448	$ 608,313	$ 539,331	$ 638,617	$ 762,254	$ 1,174,956	$ 1,881,983	$ 3,115,158	$ 5,545,028

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

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