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Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Cash flows from operating activities    
Cash received for accrued income $ 949,754 $ 1,327,099
Cash paid for expenses (604,709) (978,603)
Net cash provided by operating activities 345,045 348,496
Cash flows from financing activities    
Cash received to purchase redeemable shares 27,459,850 19,783,211
Cash paid to redeem redeemable shares (77,802,540) (64,297,605)
Cash paid for distributions (338,684) (344,567)
Net cash used in financing activities (50,681,374) (44,858,961)
Adjustment to period cash flows due to currency movement (16,338,466) (3,084,572)
Decrease in cash (66,674,795) (47,595,037)
Cash at beginning of period 338,495,100 492,456,362
Cash at end of period 271,820,305 444,861,325
Reconciliation of net income to net cash provided by operating activities    
Net Income 336,319 364,509
Adjustments to reconcile net income to net cash provided by operating activities:    
Receivable from accrued interest (139,781) (217,996)
Prior period receivable from accrued interest 177,335 223,499
Currency translation adjustment (3,718) 56
Accrued sponsor fee 90,368 148,220
Prior period accrued sponsor fee (115,478) (169,792)
Net cash provided by operating activities $ 345,045 $ 348,496