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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 $ 368,783 $ 510,445  
Cash paid for expenses (138,418) (175,199)  
Net cash provided by operating activities 230,365 335,246  
Cash flows from financing activities      
Cash received to purchase redeemable shares 3,872,577 14,883,020  
Cash paid to redeem redeemable shares (19,361,957) (14,878,149)  
Cash paid for distributions (227,501) (340,276)  
Net cash used in financing activities (15,716,881) (335,405)  
Adjustment to period cash flows due to currency movement 7,247,961 (423,009)  
Decrease in cash (8,238,555) (423,168)  
Cash at beginning of period 141,846,880 178,822,572 $ 178,822,572
Cash at end of period 133,608,325 178,399,404 $ 141,846,880
Reconciliation of net income to net cash provided by operating activities      
Net Income 238,824 383,593  
Adjustments to reconcile net income to net cash provided by operating activities:      
Receivable from accrued interest (154,837) (206,187)  
Prior period receivable from accrued interest 144,205 156,931  
Currency translation adjustment 5,711 791  
Accrued sponsor fee 45,720 61,054  
Prior period accrued sponsor fee (49,258) (60,936)  
Net cash provided by operating activities $ 230,365 $ 335,246