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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     $ 1,062,180 $ 1,540,106  
Cash paid for expenses     (348,847) (365,712)  
Net cash provided by operating activities     713,333 1,174,394  
Cash flows from financing activities          
Cash received to purchase redeemable shares     15,051,167 7,285,815  
Cash paid to redeem redeemable shares     (22,566,422) (21,868,709)  
Cash paid for distributions     (716,437) (1,163,436)  
Net cash used in financing activities     (8,231,692) (15,746,330)  
Adjustment to period cash flows due to currency movement     (3,038,020) 11,980,602  
Decrease in cash     (10,556,379) (2,591,334)  
Cash at beginning of period     178,822,572 181,931,636 $ 181,931,636
Cash at end of period $ 168,266,193 $ 179,340,302 168,266,193 179,340,302 $ 178,822,572
Reconciliation of net income to net cash provided by operating activities          
Net Income $ 357,147 $ 517,694 740,740 1,131,640  
Adjustments to reconcile net income to net cash provided by operating activities:          
Receivable from accrued interest     (177,240) (229,456)  
Prior period receivable from accrued interest     156,931 260,546  
Currency translation adjustment     (1,507) 14,131  
Accrued sponsor fee     55,345 58,829  
Prior period accrued sponsor fee     (60,936) (61,296)  
Net cash provided by operating activities     $ 713,333 $ 1,174,394