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Statements of Cash Flows
 12 Months Ended
Oct. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 0 $ 0 $ 0
Cash paid for expenses (591,577) (832,636) (400,849)
Net cash used in operating activities (591,577) (832,636) (400,849)
Cash flows from financing activities      
Cash received to purchase redeemable shares 283,768,433 443,142,449 415,994,461
Cash paid to redeem redeemable shares (270,838,173) (477,929,067) (363,514,395)
Net cash provided by/(used in) financing activities 12,930,260 (34,786,618) 52,480,066
Adjustment to period cash flows due to currency movement (8,462,494) 17,286,580 (5,995,824)
Increase/(Decrease) in cash 3,876,189 (18,332,674) 46,083,393
Cash at beginning of year 110,280,686 128,613,360 82,529,967
Cash at end of year 114,156,875 110,280,686 128,613,360
Reconciliation of net loss to net cash used in operating activities      
Net Loss (592,192) (826,488) (420,351)
Adjustments to reconcile net loss to net cash used in operating activities:      
Currency translation adjustment 3,756 (11,238) 2,037
Accrued sponsor fee 37,756 40,116 45,403
Accrued interest expense 9,596 10,377  
Prior period accrued sponsor fee (40,116) (45,403) (27,938)
Prior period accrued interest expense (10,377)    
Net cash used in operating activities $ (591,577) $ (832,636) $ (400,849)