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Statements of Cash Flows (USD $)
 12 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2011
Cash flows from operating activities      
Cash received for accrued income $ 2,562,496 $ 3,088,776 $ 4,040,326
Cash paid for expenses (1,776,323) (2,281,264) (2,998,190)
Net cash provided by operating activities 786,173 807,512 1,042,136
Cash flows from financing activities      
Cash received to purchase redeemable shares 58,495,917 14,846,422 775,887,155
Cash paid to redeem redeemable shares (194,992,928) (153,417,420) (725,504,395)
Cash paid for distributions (770,063) (787,686) (1,055,793)
Net cash (used in)/provided by financing activities (137,267,074) (139,358,684) 49,326,967
Adjustment to period cash flows due to (17,480,361) (4,695,961) 13,692,068
(Decrease)/Increase in cash (153,961,262) (143,247,133) 64,061,171
Cash at beginning of year 492,456,362 635,703,495 571,642,324
Cash at end of year 338,495,100 492,456,362 635,703,495
Reconciliation of net income to net cash provided by operating activities      
Net Income 795,583 731,964 1,126,346
Adjustments to reconcile net income to net cash provided by operating activities:      
Receivable from accrued interest (177,335) (223,499) (360,153)
Prior period receivable from accrued interest 223,499 360,153 242,867
Currency translation adjustment (1,260) 1,556 (1,632)
Accrued sponsor fee 115,478 169,792 232,454
Prior period accrued sponsor fee (169,792) (232,454) (197,746)
Net cash provided by operating activities $ 786,173 $ 807,512 $ 1,042,136