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Statements of Cash Flows (Unaudited)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Cash flows from operating activities          
Net Comprehensive Income (Loss) $ (249,150) $ (391,347) $ (586,838) $ (703,051)  
Adjustments to reconcile net comprehensive income (loss) to net cash provided by (used in) operating activities:          
Accrued Sponsor’s fee     (31,399) 15,592  
Accrued interest expense     (16,040) 8,062  
Net cash provided by (used in) operating activities     (634,277) (679,397)  
Cash flows from financing activities          
Proceeds from purchases of redeemable capital Shares     25,880,725 188,075,978  
Redemptions of redeemable capital Shares     (78,429,814) (138,910,868)  
Japanese Yen deposits, due to depository     0 25  
Net cash provided by (used in) financing activities     (52,549,089) 49,165,135  
Effect of exchange rate on cash     (15,673,906) 607,301  
Net change in cash     (68,857,272) 49,093,039  
Cash at beginning of period     247,053,789 183,656,837 $ 183,656,837
Cash at end of period $ 178,196,517 $ 232,749,876 178,196,517 232,749,876 $ 247,053,789
Supplemental disclosure of cash flow information          
Cash paid for interest     $ 213,494 $ 229,197