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Statements of Cash Flows (Unaudited)
 12 Months Ended
Oct. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 0 $ 0 $ 0
Cash paid for expenses (2,112,462) (2,247,862) (1,441,202)
Net cash used in operating activities (2,112,462) (2,247,862) (1,441,202)
Cash flows from financing activities      
Cash received to purchase redeemable shares 1,092,051,831 1,198,371,197 1,273,611,058
Cash paid to redeem redeemable shares (1,000,949,967) (1,285,096,408) (1,100,566,383)
Net cash provided by/(used in) financing activities 91,101,864 (86,725,211) 173,044,675
Adjustment to period cash flows due to currency movement 21,039,648 (1,698,856) (30,353,078)
Increase/(Decrease) in cash 110,029,050 (90,671,929) 141,250,395
Cash at beginning of period 266,705,058 357,376,987 216,126,592
Cash at end of period 376,734,108 266,705,058 357,376,987
Reconciliation of net loss to net cash used in operating activities:      
Net Loss (2,178,761) (2,249,106) (1,505,472)
Adjustments to reconcile net loss to net cash used in operating activities:      
Currency translation adjustment 1,460 (3,062) (3,822)
Accrued sponsor fee 108,181 75,126 100,209
Accrued interest expense 109,910 78,126 48,737
Prior period accrued sponsor fee (75,126) (100,209) (78,416)
Prior period accrued interest expense (78,126) (48,737) (2,438)
Net cash used in operating activities $ (2,112,462) $ (2,247,862) $ (1,441,202)