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Statements of Cash Flows (Unaudited)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Cash flows from operating activities          
Net Comprehensive Income (Loss) $ (529,829) $ (469,408) $ (1,142,215) $ (959,668)  
Adjustments to reconcile net comprehensive income (loss) to net cash provided by (used in) operating activities:          
Accrued Sponsor’s fee     (25,376) (14,908)  
Accrued interest expense     (31,931) (11,475)  
Net cash provided by (used in) operating activities     (1,199,522) (986,051)  
Cash flows from financing activities          
Proceeds from purchases of redeemable capital Shares     124,290,283 112,838,468  
Redemptions of redeemable capital Shares     (198,102,363) (222,237,076)  
Net cash provided by (used in) financing activities     (73,812,080) (109,398,608)  
Effect of exchange rate on cash     (301,740) (687,031)  
Net change in cash     (75,313,342) (111,071,690)  
Cash at beginning of period     271,521,028 338,875,956 $ 338,875,956
Cash at end of period $ 196,207,686 $ 227,804,266 196,207,686 227,804,266 $ 271,521,028
Supplemental disclosure of cash flow information          
Cash paid for interest     $ 671,438 $ 496,505