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Statements of Changes in Shareholders' Equity and Redeemable Capital Shares (unaudited) - USD ($)
Total
Retained Earnings [Member]
Redeemable Capital Shares [Member]
Balance at Dec. 31, 2021     $ 211,443,880
Balance, Shares at Dec. 31, 2021     2,000,000
Purchases of Shares     $ 89,158,392
Purchases of Shares, Shares     850,000
Redemption of Shares     $ (108,633,073)
Redemption of Shares, Shares     (1,050,000)
Net Increase (Decrease) due to Share Transactions     $ (19,474,681)
Net Increase (Decrease) due to Share Transactions, Shares     (200,000)
Net Comprehensive Income (Loss) $ (527,541) $ (527,541)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 527,541 527,541 $ (527,541)
Adjustment of Redeemable Capital Shares to Redemption Value     (5,739,486)
Balance at Mar. 31, 2022     $ 185,702,172
Balance, Shares at Mar. 31, 2022     1,800,000
Balance at Dec. 31, 2022 $ 285,606,461   $ 285,606,461
Balance, Shares at Dec. 31, 2022 2,900,000   2,900,000
Purchases of Shares     $ 34,456,081
Purchases of Shares, Shares     350,000
Redemption of Shares     $ (59,704,493)
Redemption of Shares, Shares     (600,000)
Net Increase (Decrease) due to Share Transactions     $ (25,248,412)
Net Increase (Decrease) due to Share Transactions, Shares     (250,000)
Distributions $ (396,467) (396,467)  
Net Comprehensive Income (Loss) 625,747 625,747  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings (229,280) $ (229,280) $ 229,279
Adjustment of Redeemable Capital Shares to Redemption Value     5,305,902
Balance at Mar. 31, 2023 $ 265,893,230   $ 265,893,230
Balance, Shares at Mar. 31, 2023 2,650,000   2,650,000