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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     $ 0 $ 0  
Cash paid for expenses     (446,276) (638,279)  
Net cash used in operating activities     (446,276) (638,279)  
Cash flows from financing activities          
Cash received to purchase redeemable shares     274,407,976 389,839,219  
Cash paid to redeem redeemable shares     (265,790,488) (393,911,854)  
Net cash provided by/(used in) financing activities     8,617,488 (4,072,635)  
Adjustment to period cash flows due to currency movement     (5,259,281) 22,340,520  
Increase in cash     2,911,931 17,629,606  
Cash at beginning of period     110,280,686 128,613,360 $ 128,613,360
Cash at end of period $ 113,192,617 $ 146,242,966 113,192,617 146,242,966 $ 110,280,686
Reconciliation of net loss to net cash used in operating activities          
Net Loss $ (152,159) $ (183,904) (447,116) (647,040)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Currency translation adjustment     2,455 (10,930)  
Accrued sponsor fee     38,876 51,701  
Accrued interest expense     10,002 13,393  
Prior period accrued sponsor fee     (40,116) (45,403)  
Prior period accrued interest expense     (10,377)    
Net cash used in operating activities     $ (446,276) $ (638,279)