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Statements of Cash Flows (Unaudited)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Jul. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Oct. 31, 2016
USD ($)
Cash flows from operating activities          
Cash received for accrued income     $ 64,158 $ 19,669  
Cash paid for expenses     (570,532) (633,898)  
Net cash used in operating activities     (506,374) (614,229)  
Cash flows from financing activities          
Cash received to purchase redeemable shares     29,746,940 18,604,755  
Cash paid to redeem redeemable shares     (40,902,777) (26,036,050)  
Net cash used in financing activities     (11,155,837) (7,431,295)  
Adjustment to period cash flows due to currency movement     13,304,747 537,231  
Increase/(Decrease) in cash     1,642,536 (7,508,293)  
Cash at beginning of period     195,609,315 216,342,962 $ 216,342,962
Cash at end of period $ 197,251,851 $ 208,834,669 197,251,851 208,834,669 $ 195,609,315
Reconciliation of net loss to net cash used in operating activities          
Net Loss $ (142,342) $ (194,798) (475,234) (610,001)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Receivable from accrued interest     (29,748) (2,276)  
Currency translation adjustment     (2,929) (371)  
Accrued sponsor fee     66,831 71,904  
Prior period accrued sponsor fee     (65,294) (73,485)  
Net cash used in operating activities     $ (506,374) $ (614,229)