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Statements of Cash Flows (Unaudited)
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Oct. 31, 2015
USD ($)
Cash flows from operating activities          
Cash paid for expenses     $ (445,512) $ (198,753)  
Net cash used in operating activities     (445,512) (198,753)  
Cash flows from financing activities          
Cash received to purchase redeemable shares     332,310,495 278,402,153  
Cash paid to redeem redeemable shares     (323,818,936) (266,091,486)  
Net cash provided by financing activities     8,491,559 12,310,667  
Adjustment to period cash flows due to currency movement     17,169,917 (5,303,021)  
Increase in cash     25,215,964 6,808,893  
Cash at beginning of period     128,613,360 82,529,967 $ 82,529,967
Cash at end of period $ 153,829,324 $ 89,338,860 153,829,324 89,338,860 $ 128,613,360
Reconciliation of net loss to net cash used in operating activities          
Net Loss $ (246,846) $ (94,659) (463,136) (198,334)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Currency translation adjustment     (5,966) 1,799  
Accrued sponsor fee     66,391 25,720  
Accrued interest expense     2,602    
Prior period accrued sponsor fee     (45,403) (27,938)  
Net cash used in operating activities     $ (445,512) $ (198,753)