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Statements of Cash Flows (Unaudited)
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Oct. 31, 2016
USD ($)
Cash flows from operating activities          
Cash received for accrued income     $ 41,725 $ 1,775  
Cash paid for expenses     (384,880) (419,618)  
Net cash used in operating activities     (343,155) (417,843)  
Cash flows from financing activities          
Cash received to purchase redeemable shares     25,955,104 14,684,858  
Cash paid to redeem redeemable shares     (37,076,936) (18,351,127)  
Net cash used in financing activities     (11,121,832) (3,666,269)  
Adjustment to period cash flows due to currency movement     (3,577,199) 9,307,708  
(Decrease)/Increase in cash     (15,042,186) 5,223,596  
Cash at beginning of period     195,609,315 216,342,962 $ 216,342,962
Cash at end of period $ 180,567,129 $ 221,566,558 180,567,129 221,566,558 $ 195,609,315
Reconciliation of net loss to net cash used in operating activities          
Net Loss $ (148,397) $ (210,724) (332,892) (415,203)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Receivable from accrued interest     (4,930)    
Currency translation adjustment     1,001 (2,869)  
Accrued sponsor fee     58,960 73,714  
Prior period accrued sponsor fee     (65,294) (73,485)  
Net cash used in operating activities     $ (343,155) $ (417,843)