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Statements of Cash Flows
 12 Months Ended
Oct. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 1,727,420 $ 2,152,354 $ 2,705,770
Cash paid for Sponsor's fee (514,607) (693,136) (718,687)
Net cash provided by operating activities 1,212,813 1,459,218 1,987,083
Cash flows from financing activities      
Cash received to purchase redeemable Shares 18,880,911 34,369,885 18,499,561
Cash paid to redeem redeemable Shares (30,200,732) (72,530,089) (33,314,772)
Cash paid for distributions (1,210,590) (1,460,231) (1,972,470)
Net cash used in financing activities (12,530,411) (39,620,435) (16,787,681)
Adjustment to period cash flows due to currency movement (10,039,407) 1,185,525 11,691,534
Decrease in cash (21,357,005) (36,975,692) (3,109,064)
Cash at beginning of year 141,846,880 178,822,572 181,931,636
Cash at end of year 120,489,875 141,846,880 178,822,572
Reconciliation of net comprehensive income to net cash provided by operating activities      
Net Comprehensive Income 1,226,700 1,455,322 1,862,467
Adjustments to reconcile net comprehensive income to net cash provided by operating activities:      
Receivable from accrued interest (144,808) (144,205) (156,931)
Prior period receivable from accrued interest 144,205 156,931 260,546
Effect of exchange rate on cash (4,279) 2,848 21,361
Accrued Sponsor's fee 40,253 49,258 60,936
Prior period accrued Sponsor's fee (49,258) (60,936) (61,296)
Net cash provided by operating activities $ 1,212,813 $ 1,459,218 $ 1,987,083