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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     $ 1,600,467 $ 2,175,947  
Cash paid for expenses     (517,435) (539,060)  
Net cash provided by operating activities     1,083,032 1,636,887  
Cash flows from financing activities          
Cash received to purchase redeemable shares     18,876,552 10,993,512  
Cash paid to redeem redeemable shares     (30,191,441) (25,664,378)  
Cash paid for distributions     (1,084,999) (1,623,276)  
Net cash used in financing activities     (12,399,888) (16,294,142)  
Adjustment to period cash flows due to currency movement     8,131,348 11,338,075  
Decrease in cash     (3,185,508) (3,319,180)  
Cash at beginning of period     178,822,572 181,931,636 $ 181,931,636
Cash at end of period $ 175,637,064 $ 178,612,456 175,637,064 178,612,456 $ 178,822,572
Reconciliation of net income to net cash provided by in operating activities          
Net Income $ 377,944 $ 452,253 1,118,684 1,583,893  
Adjustments to reconcile net income to net cash provided by operating activities:          
Receivable from accrued interest     (198,421) (221,313)  
Prior period receivable from accrued interest     156,931 260,546  
Currency translation adjustment     7,078 14,805  
Accrued sponsor fee     59,696 60,252  
Prior period accrued sponsor fee     (60,936) (61,296)  
Net cash provided by operating activities     $ 1,083,032 $ 1,636,887