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Statement of Changes in Shareholders' Equity and Redeemable Capital Shares - USD ($)
Total
Retained Earnings [Member]
Redeemable Capital Shares [Member]
Balance at Dec. 31, 2019     $ 287,263,846
Balance, Shares at Dec. 31, 2019     2,700,000
Purchases of Shares     $ 496,252,390
Purchases of Shares, Shares     4,550,000
Redemption of Shares     $ (475,189,145)
Redemption of Shares, Shares     (4,400,000)
Net Increase (Decrease) due to Share Transactions     $ 21,063,245
Net Increase (Decrease) due to Share Transactions, Shares     150,000
Net Comprehensive Income (Loss) $ (2,571,861) $ (2,571,861)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 2,571,861 2,571,861 $ (2,571,861)
Adjustment of Redeemable Capital Shares to Redemption Value     21,761,280
Balance at Dec. 31, 2020 $ 327,516,510   $ 327,516,510
Balance, Shares at Dec. 31, 2020 2,850,000   2,850,000
Purchases of Shares     $ 184,370,935
Purchases of Shares, Shares     1,650,000
Redemption of Shares     $ (275,381,729)
Redemption of Shares, Shares     (2,500,000)
Net Increase (Decrease) due to Share Transactions     $ (91,010,794)
Net Increase (Decrease) due to Share Transactions, Shares     (850,000)
Net Comprehensive Income (Loss) $ (2,957,966) (2,957,966)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 2,957,966 $ 2,957,966 $ (2,957,966)
Adjustment of Redeemable Capital Shares to Redemption Value     (22,103,870)
Balance at Dec. 31, 2021 $ 211,443,880   $ 211,443,880
Balance, Shares at Dec. 31, 2021 2,000,000   2,000,000