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Statements of Cash Flows (Unaudited)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Jul. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Oct. 31, 2017
USD ($)
Cash flows from operating activities          
Cash received for accrued income     $ 1,254,368 $ 1,600,467  
Cash paid for Sponsor's fee     (391,267) (517,435)  
Net cash provided by operating activities     863,101 1,083,032  
Cash flows from financing activities          
Cash received to purchase redeemable shares     15,330,483 18,876,552  
Cash paid to redeem redeemable shares     (22,987,378) (30,191,441)  
Cash paid for distributions     (861,786) (1,084,999)  
Net cash used in financing activities     (8,518,681) (12,399,888)  
Adjustment to period cash flows due to currency movement     (4,092,877) 8,131,348  
Decrease in cash     (11,748,457) (3,185,508)  
Cash at beginning of period     141,846,880 178,822,572 $ 178,822,572
Cash at end of period $ 130,098,423 $ 175,637,064 130,098,423 175,637,064 $ 141,846,880
Reconciliation of net income to net cash provided by operating activities          
Net Income $ 367,223 $ 377,944 905,055 1,118,684  
Adjustments to reconcile net income to net cash provided by operating activities:          
Receivable from accrued interest     (178,475) (198,421)  
Prior period receivable from accrued interest     144,205 156,931  
Currency translation adjustment     (1,674) 7,078  
Accrued Sponsor's fee     43,248 59,696  
Prior period accrued Sponsor's fee     (49,258) (60,936)  
Net cash provided by operating activities     $ 863,101 $ 1,083,032