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Statements of Cash Flows
 12 Months Ended
Oct. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 22,818 $ 732,747 $ 1,786,487
Cash paid for expenses (840,409) (869,218) (1,140,388)
Net cash (used in)/provided by operating activities (817,591) (136,471) 646,099
Cash flows from financing activities      
Cash received to purchase redeemable shares 26,133,576 127,858,942 36,495,266
Cash paid to redeem redeemable shares (41,053,575) (127,864,231) (100,362,128)
Cash paid for distributions   (132,881) (637,630)
Net cash used in financing activities (14,919,999) (138,170) (64,504,492)
Adjustment to period cash flows due to currency movement (4,996,057) (34,740,743) (23,278,361)
Decrease in cash (20,733,647) (35,015,384) (87,136,754)
Cash at beginning of year 216,342,962 251,358,346 338,495,100
Cash at end of year 195,609,315 216,342,962 251,358,346
Reconciliation of net (loss)/income to net cash (used in)/provided by operating activities      
Net (Loss)/Income (810,823) (246,512) 646,367
Adjustments to reconcile net (loss)/income to net cash (used in)/provided by operating activities:      
Receivable from accrued interest     (142,463)
Prior period receivable from accrued interest   142,463 177,335
Currency translation adjustment 1,423 (20,068) (5,501)
Accrued sponsor fee 65,294 73,485 85,839
Prior period accrued sponsor fee (73,485) (85,839) (115,478)
Net cash (used in)/provided by operating activities $ (817,591) $ (136,471) $ 646,099