Selected Quarterly Information (Unaudited) - Summary of Selected Quarterly Information (Unaudited) (Detail) (USD $)	3 Months Ended	12 Months Ended
Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Income
Interest Income						$ 33,329	$ 58,256	$ 314,773		$ 406,358	$ 2,205,838
Total Income						33,329	58,256	314,773		406,358	2,205,838
Expenses
Sponsor's fee	(212,746)	(222,907)	(255,357)	(248,127)	(300,984)	(263,385)	(261,139)	(371,167)	(939,137)	(1,196,675)	(1,530,318)
Total Expenses	(212,746)	(222,907)	(255,357)	(248,127)	(300,984)	(263,385)	(261,139)	(371,167)	(939,137)	(1,196,675)	(1,530,318)
Net Loss	(212,746)	(222,907)	(255,357)	(248,127)	(300,984)	(230,056)	(202,883)	(56,394)	(939,137)	(790,317)	675,520
Basic and Diluted Earnings per Share	$ (0.13)	$ (0.13)	$ (0.13)	$ (0.13)	$ (0.13)	$ (0.11)	$ (0.10)	$ (0.02)	$ (0.52)	$ (0.34)	$ 0.25
Weighted-average Shares Outstanding	1,596,739	1,705,978	2,012,921	1,902,174	2,350,543	2,101,630	2,030,556	2,880,435	1,802,740	2,342,486	2,697,260
Cash Dividends per Share								$ 0.04		$ 0.04	$ 0.25
Other Comprehensive (Loss)/Income:
Currency translation adjustment	(2,463)	(3,511)	(1,400)	(9,404)	(4,943)	4,199	(554)	468	(16,778)	(830)	4,717
Total Comprehensive Loss	$ (215,209)	$ (226,418)	$ (256,757)	$ (257,531)	$ (305,927)	$ (225,857)	$ (203,437)	$ (55,926)	$ (955,915)	$ (791,147)	$ 680,237

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

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