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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     $ 0 $ 0  
Cash paid for expenses     (298,095) (445,512)  
Net cash used in operating activities     (298,095) (445,512)  
Cash flows from financing activities          
Cash received to purchase redeemable shares     226,714,097 332,310,495  
Cash paid to redeem redeemable shares     (226,674,696) (323,818,936)  
Net cash provided by financing activities     39,401 8,491,559  
Adjustment to period cash flows due to currency movement     (6,319,696) 17,169,917  
(Decrease)/Increase in cash     (6,578,390) 25,215,964  
Cash at beginning of period     110,280,686 128,613,360 $ 128,613,360
Cash at end of period $ 103,702,296 $ 153,829,324 103,702,296 153,829,324 $ 110,280,686
Reconciliation of net loss to net cash used in operating activities          
Net Loss $ (143,771) $ (246,846) (294,957) (463,136)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Currency translation adjustment     2,913 (5,966)  
Accrued sponsor fee     35,176 66,391  
Accrued interest expense     9,266 2,602  
Prior period accrued sponsor fee     (40,116) (45,403)  
Prior period accrued interest expense     (10,377)    
Net cash used in operating activities     $ (298,095) $ (445,512)