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Statements of Cash Flows
 12 Months Ended
Oct. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 2,152,354 $ 2,705,770 $ 4,156,034
Cash paid for expenses (693,136) (718,687) (846,019)
Net cash provided by operating activities 1,459,218 1,987,083 3,310,015
Cash flows from financing activities      
Cash received to purchase redeemable shares 34,369,885 18,499,561 108,329,725
Cash paid to redeem redeemable shares (72,530,089) (33,314,772) (166,357,064)
Cash paid for distributions (1,460,231) (1,972,470) (3,292,732)
Net cash used in financing activities (39,620,435) (16,787,681) (61,320,071)
Adjustment to period cash flows due to currency movement 1,185,525 11,691,534 (50,162,083)
Decrease in cash (36,975,692) (3,109,064) (108,172,139)
Cash at beginning of year 178,822,572 181,931,636 290,103,775
Cash at end of year 141,846,880 178,822,572 181,931,636
Reconciliation of net income to net cash provided by operating activities      
Net Income 1,455,322 1,862,467 3,214,140
Adjustments to reconcile net income to net cash provided by operating activities:      
Receivable from accrued interest (144,205) (156,931) (260,546)
Prior period receivable from accrued interest 156,931 260,546 495,350
Currency translation adjustment 2,848 21,361 (109,216)
Accrued sponsor fee 49,258 60,936 61,296
Prior period accrued sponsor fee (60,936) (61,296) (91,009)
Net cash provided by operating activities $ 1,459,218 $ 1,987,083 $ 3,310,015