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Statements of Cash Flows
 12 Months Ended
Oct. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Cash flows from operating activities      
Cash received for accrued income $ 2,705,770 $ 4,156,034 $ 7,077,774
Cash paid for expenses (718,687) (846,019) (1,300,672)
Net cash provided by operating activities 1,987,083 3,310,015 5,777,102
Cash flows from financing activities      
Cash received to purchase redeemable shares 18,499,561 108,329,725 91,514,294
Cash paid to redeem redeemable shares (33,314,772) (166,357,064) (201,328,373)
Cash paid for distributions (1,972,470) (3,292,732) (5,637,628)
Net cash used in financing activities (16,787,681) (61,320,071) (115,451,707)
Adjustment to period cash flows due to currency movement 11,691,534 (50,162,083) (26,354,927)
Decrease in cash (3,109,064) (108,172,139) (136,029,532)
Cash at beginning of year 181,931,636 290,103,775 426,133,307
Cash at end of year 178,822,572 181,931,636 290,103,775
Reconciliation of net income to net cash provided by in operating activities      
Net Income 1,862,467 3,214,140 5,623,641
Adjustments to reconcile net income to net cash provided by operating activities:      
Receivable from accrued interest (156,931) (260,546) (495,350)
Prior period receivable from accrued interest 260,546 495,350 736,066
Currency translation adjustment 21,361 (109,216) (34,737)
Accrued sponsor fee 60,936 61,296 91,009
Prior period accrued sponsor fee (61,296) (91,009) (143,527)
Net cash provided by operating activities $ 1,987,083 $ 3,310,015 $ 5,777,102