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Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Cash flows from operating activities    
Cash received for accrued income   $ 543,433
Cash paid for expenses (512,776) (659,177)
Net cash used in operating activities (512,776) (115,744)
Cash flows from financing activities    
Cash received to purchase redeemable shares 480,729,581 1,064,770,149
Cash paid to redeem redeemable shares (461,284,421) (1,018,753,958)
Cash paid for distributions   (104,564)
Net cash provided by financing activities 19,445,160 45,911,627
Adjustment to period cash flows due to currency movement 4,732,056 (13,004,517)
Increase in cash 23,664,440 32,791,366
Cash at beginning of period 263,931,355 257,008,201
Cash at end of period 287,595,795 289,799,567
Reconciliation of net loss to net cash used in operating activities    
Net Loss (503,484) (259,277)
Adjustments to reconcile net loss to net cash used in operating activities:    
Receivable from accrued interest   (14,221)
Prior period receivable from accrued interest   195,055
Currency translation adjustment (1,735) (4,915)
Accrued sponsor fee 96,685 74,136
Prior period accrued sponsor fee (104,242) (106,522)
Net cash used in operating activities $ (512,776) $ (115,744)