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Statements of Cash Flows (Unaudited)
 3 Months Ended 12 Months Ended
Jan. 31, 2018
USD ($)
Jan. 31, 2017
USD ($)
Oct. 31, 2017
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 0 $ 0  
Cash paid for expenses (139,854) (130,656)  
Net cash used in operating activities (139,854) (130,656)  
Cash flows from financing activities      
Cash received to purchase redeemable shares 38,469,313 136,181,023  
Cash paid to redeem redeemable shares (17,109,783) (55,333,231)  
Net cash provided by financing activities 21,359,530 80,847,792  
Adjustment to period cash flows due to currency movement 5,281,105 (6,806,407)  
Increase in cash 26,500,781 73,910,729  
Cash at beginning of period 114,156,875 110,280,686 $ 110,280,686
Cash at end of period 140,657,656 184,191,415 $ 114,156,875
Reconciliation of net loss to net cash used in operating activities      
Net Loss (140,590) (151,186)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Currency translation adjustment (1,960) 3,225  
Accrued sponsor fee 40,072 54,304  
Accrued interest expense 9,976 13,494  
Prior period accrued sponsor fee (37,756) (40,116)  
Prior period accrued interest expense (9,596) (10,377)  
Net cash used in operating activities $ (139,854) $ (130,656)