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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   $ 859  
Cash paid for expenses $ (202,204) (205,283)  
Net cash used in operating activities (202,204) (204,424)  
Cash flows from financing activities      
Cash received to purchase redeemable shares 11,123,338 7,223,828  
Cash paid to redeem redeemable shares (22,234,112) (7,225,842)  
Net cash used in financing activities (11,110,774) (2,014)  
Adjustment to period cash flows due to currency movement 5,218,163 (15,199,397)  
Decrease in cash (6,094,815) (15,405,835)  
Cash at beginning of period 195,609,315 216,342,962 $ 216,342,962
Cash at end of period 189,514,500 200,937,127 $ 195,609,315
Reconciliation of net loss to net cash used in operating activities      
Net Loss (184,495) (204,479)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Receivable from accrued interest (16,778)    
Currency translation adjustment (1,424) 5,165  
Accrued sponsor fee 65,787 68,375  
Prior period accrued sponsor fee (65,294) (73,485)  
Net cash used in operating activities $ (202,204) $ (204,424)