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Selected Quarterly Information (Unaudited) - Summary of Selected Quarterly Information (Unaudited) (Detail) (USD $)	3 Months Ended								12 Months Ended
	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Income
Interest Income		$ 10,020us-gaap_InvestmentIncomeInterest	$ 5,817us-gaap_InvestmentIncomeInterest	$ 5,184us-gaap_InvestmentIncomeInterest					$ 21,021us-gaap_InvestmentIncomeInterest		$ 406,358us-gaap_InvestmentIncomeInterest
Total Income		10,020us-gaap_Revenues	5,817us-gaap_Revenues	5,184us-gaap_Revenues					21,021us-gaap_Revenues		406,358us-gaap_Revenues
Expenses
Sponsor's fee	(208,696)us-gaap_SponsorFees	(217,812)us-gaap_SponsorFees	(199,786)us-gaap_SponsorFees	(233,452)us-gaap_SponsorFees	(212,746)us-gaap_SponsorFees	(222,907)us-gaap_SponsorFees	(255,357)us-gaap_SponsorFees	(248,127)us-gaap_SponsorFees	(859,746)us-gaap_SponsorFees	(939,137)us-gaap_SponsorFees	(1,196,675)us-gaap_SponsorFees
Interest expense	(2,522)us-gaap_InterestExpense								(2,522)us-gaap_InterestExpense
Total Expenses	(211,218)us-gaap_OperatingExpenses	(217,812)us-gaap_OperatingExpenses	(199,786)us-gaap_OperatingExpenses	(233,452)us-gaap_OperatingExpenses	(212,746)us-gaap_OperatingExpenses	(222,907)us-gaap_OperatingExpenses	(255,357)us-gaap_OperatingExpenses	(248,127)us-gaap_OperatingExpenses	(862,268)us-gaap_OperatingExpenses	(939,137)us-gaap_OperatingExpenses	(1,196,675)us-gaap_OperatingExpenses
Net Loss	(211,218)us-gaap_NetIncomeLoss	(207,792)us-gaap_NetIncomeLoss	(193,969)us-gaap_NetIncomeLoss	(228,268)us-gaap_NetIncomeLoss	(212,746)us-gaap_NetIncomeLoss	(222,907)us-gaap_NetIncomeLoss	(255,357)us-gaap_NetIncomeLoss	(248,127)us-gaap_NetIncomeLoss	(841,247)us-gaap_NetIncomeLoss	(939,137)us-gaap_NetIncomeLoss	(790,317)us-gaap_NetIncomeLoss
Basic and Diluted Earnings per Share	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.52)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.52)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.34)us-gaap_EarningsPerShareBasicAndDiluted
Weighted-average Shares Outstanding	1,623,913us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	1,613,043us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	1,502,247us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	1,722,826us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	1,596,739us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	1,705,978us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	2,012,921us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	1,902,174us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	1,616,438us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	1,802,740us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	2,342,486us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Cash Dividends per Share	$ 0us-gaap_CommonStockDividendsPerShareCashPaid	$ 0us-gaap_CommonStockDividendsPerShareCashPaid	$ 0us-gaap_CommonStockDividendsPerShareCashPaid	$ 0us-gaap_CommonStockDividendsPerShareCashPaid	$ 0us-gaap_CommonStockDividendsPerShareCashPaid	$ 0us-gaap_CommonStockDividendsPerShareCashPaid	$ 0us-gaap_CommonStockDividendsPerShareCashPaid	$ 0us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.00us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.00us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.04us-gaap_CommonStockDividendsPerShareCashPaid
Other Comprehensive Income/(Loss):
Currency translation adjustment	7,025us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	3,691us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(1,374)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2,022us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(2,463)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(3,511)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(1,400)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(9,404)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	11,364us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(16,778)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(830)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Total Comprehensive Loss	$ (204,193)us-gaap_ComprehensiveIncomeNetOfTax	$ (204,101)us-gaap_ComprehensiveIncomeNetOfTax	$ (195,343)us-gaap_ComprehensiveIncomeNetOfTax	$ (226,246)us-gaap_ComprehensiveIncomeNetOfTax	$ (215,209)us-gaap_ComprehensiveIncomeNetOfTax	$ (226,418)us-gaap_ComprehensiveIncomeNetOfTax	$ (256,757)us-gaap_ComprehensiveIncomeNetOfTax	$ (257,531)us-gaap_ComprehensiveIncomeNetOfTax	$ (829,883)us-gaap_ComprehensiveIncomeNetOfTax	$ (955,915)us-gaap_ComprehensiveIncomeNetOfTax	$ (791,147)us-gaap_ComprehensiveIncomeNetOfTax

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