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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 paid for expenses $ (832,636) $ (400,849) $ (522,818)
Net cash used in operating activities (832,636) (400,849) (522,818)
Cash flows from financing activities      
Cash received to purchase redeemable shares 443,142,449 415,994,461 208,080,277
Cash paid to redeem redeemable shares (477,929,067) (363,514,395) (255,292,426)
Net cash (used in)/provided by financing activities (34,786,618) 52,480,066 (47,212,149)
Adjustment to period cash flows due to currency movement 17,286,580 (5,995,824) (14,252,590)
(Decrease)/Increase in cash (18,332,674) 46,083,393 (61,987,557)
Cash at beginning of year 128,613,360 82,529,967 144,517,524
Cash at end of year 110,280,686 128,613,360 82,529,967
Reconciliation of net loss to net cash used in operating activities      
Net Loss (826,488) (420,351) (503,842)
Adjustments to reconcile net loss to net cash used in operating activities:      
Currency translation adjustment (11,238) 2,037 6,760
Accrued sponsor fee 40,116 45,403 27,938
Accrued interest expense 10,377    
Prior period accrued sponsor fee (45,403) (27,938) (53,674)
Net cash used in operating activities $ (832,636) $ (400,849) $ (522,818)