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Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Cash flows from operating activities    
Cash received for accrued income $ 524,435 $ 677,331
Cash paid for expenses (327,691) (510,430)
Net cash provided by operating activities 196,744 166,901
Cash flows from financing activities    
Cash received to purchase redeemable shares 23,266,961 20,016,166
Cash paid to redeem redeemable shares (55,839,541) (25,020,438)
Cash paid for distributions (193,235) (165,574)
Net cash used in financing activities (32,765,815) (5,169,846)
Adjustment to period cash flows due to currency movement (20,535,379) 346,761
Decrease in cash (53,104,450) (4,656,184)
Cash at beginning of period 338,495,100 492,456,362
Cash at end of period 285,390,650 487,800,178
Reconciliation of net income to net cash provided by operating activities    
Net Income 192,446 169,088
Adjustments to reconcile net income to net cash provided by operating activities:    
Receivable from accrued interest (152,071) (222,357)
Prior period receivable from accrued interest 177,335 223,499
Currency translation adjustment (3,822) 24
Accrued sponsor fee 98,334 166,439
Prior period accrued sponsor fee (115,478) (169,792)
Net cash provided by operating activities $ 196,744 $ 166,901