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Statements of Cash Flows (Unaudited)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Cash flows from operating activities          
Net Comprehensive Income (Loss) $ (298,603) $ (383,265) $ (885,563) $ (1,086,316)  
Adjustments to reconcile net comprehensive income (loss) to net cash provided by (used in) operating activities:          
Accrued Sponsor’s fee     (19,476) 21,734  
Accrued interest expense     (9,994) 11,136  
Net cash provided by (used in) operating activities     (915,033) (1,053,446)  
Cash flows from financing activities          
Proceeds from purchases of redeemable capital Shares     47,226,990 223,565,910  
Redemptions of redeemable capital Shares     (78,429,814) (161,124,939)  
Net cash provided by (used in) financing activities     (31,202,824) 62,440,971  
Effect of exchange rate on cash     (16,862,030) 5,987,729  
Net change in cash     (48,979,887) 67,375,254  
Cash at beginning of period     247,053,789 183,656,837 $ 183,656,837
Cash at end of period $ 198,073,902 $ 251,032,091 198,073,902 251,032,091 $ 247,053,789
Supplemental disclosure of cash flow information          
Cash paid for interest     $ 308,061 $ 355,366