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Statements of Cash Flows (Unaudited)
 3 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Jan. 31, 2016
USD ($)
Oct. 31, 2016
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 0 $ 0  
Cash paid for expenses (130,656) (188,474)  
Net cash used in operating activities (130,656) (188,474)  
Cash flows from financing activities      
Cash received to purchase redeemable shares 136,181,023 292,616,395  
Cash paid to redeem redeemable shares (55,333,231) (124,251,919)  
Net cash provided by financing activities 80,847,792 168,364,476  
Adjustment to period cash flows due to currency movement (6,806,407) (658,527)  
Increase in cash 73,910,729 167,517,475  
Cash at beginning of period 110,280,686 128,613,360 $ 128,613,360
Cash at end of period 184,191,415 296,130,835 $ 110,280,686
Reconciliation of net loss to net cash used in operating activities      
Net Loss (151,186) (216,290)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Currency translation adjustment 3,225 187  
Accrued sponsor fee 54,304 73,032  
Accrued interest expense 13,494    
Prior period accrued sponsor fee (40,116) (45,403)  
Prior period accrued interest expense (10,377)    
Net cash used in operating activities $ (130,656) $ (188,474)