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Statements of Cash Flows (Unaudited)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Jul. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Oct. 31, 2015
USD ($)
Cash flows from operating activities          
Cash received for accrued income     $ 19,669 $ 715,081  
Cash paid for expenses     (633,898) (646,886)  
Net cash (used in)/provided by operating activities     (614,229) 68,195  
Cash flows from financing activities          
Cash received to purchase redeemable shares     18,604,755 101,873,544  
Cash paid to redeem redeemable shares     (26,036,050) (101,885,222)  
Cash paid for distributions       (135,495)  
Net cash used in financing activities     (7,431,295) (147,173)  
Adjustment to period cash flows due to currency movement     537,231 (33,517,260)  
Decrease in cash     (7,508,293) (33,596,238)  
Cash at beginning of period     216,342,962 251,358,346 $ 251,358,346
Cash at end of period $ 208,834,669 $ 217,762,108 208,834,669 217,762,108 $ 216,342,962
Reconciliation of net loss to net cash (used in)/provided by operating activities          
Net Loss $ (194,798) $ (65,044) (610,001) (25,506)  
Adjustments to reconcile net loss to net cash (used in)/provided by operating activities:          
Receivable from accrued interest     (2,276) (28,213)  
Prior period receivable from accrued interest       142,463  
Currency translation adjustment     (371) (7,848)  
Accrued sponsor fee     71,904 73,138  
Prior period accrued sponsor fee     (73,485) (85,839)  
Net cash (used in)/provided by operating activities     $ (614,229) $ 68,195