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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, 2018     $ 316,828,837
Balance, Shares at Dec. 31, 2018     2,900,000
Purchases of Shares     $ 292,000,952
Purchases of Shares, Shares     2,750,000
Redemption of Shares     $ (316,371,006)
Redemption of Shares, Shares     (2,950,000)
Net Increase (Decrease) due to Share Transactions     $ (24,370,054)
Net Increase (Decrease) due to Share Transactions, Shares     (200,000)
Net Comprehensive Income (Loss) $ (2,038,193) $ (2,038,193)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 2,038,193 2,038,193 $ (2,038,193)
Adjustment of Redeemable Capital Shares to Redemption Value     (3,156,744)
Balance at Dec. 31, 2019 $ 287,263,846   $ 287,263,846
Balance, Shares at Dec. 31, 2019 2,700,000   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