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Statements of Changes in Shareholders' Equity and Redeemable Capital Shares - USD ($)
Total
Retained Earnings
Redeemable Capital Shares
Balance at Dec. 31, 2020     $ 246,926,201
Balance, Shares at Dec. 31, 2020     2,700,000
Purchases of Shares     $ 63,758,649
Purchases of Shares, Shares     750,000
Redemption of Shares     $ (115,719,701)
Redemption of Shares, Shares     (1,350,000)
Net Increase (Decrease) due to Share Transactions     $ (51,961,052)
Net Increase (Decrease) due to Share Transactions, Shares     (600,000)
Net Comprehensive Income (Loss) $ (1,163,058) $ (1,163,058)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,163,058 1,163,058 $ (1,163,058)
Adjustment of Redeemable Capital Shares to Redemption Value     (22,648,204)
Balance at Dec. 31, 2021 $ 171,153,887   $ 171,153,887
Balance, Shares at Dec. 31, 2021 2,100,000   2,100,000
Purchases of Shares     $ 159,508,534
Purchases of Shares, Shares     2,250,000
Redemption of Shares     $ (119,547,237)
Redemption of Shares, Shares     (1,700,000)
Net Increase (Decrease) due to Share Transactions     $ 39,961,297
Net Increase (Decrease) due to Share Transactions, Shares     550,000
Net Comprehensive Income (Loss) $ (1,053,063) (1,053,063)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,053,063 $ 1,053,063 $ (1,053,063)
Adjustment of Redeemable Capital Shares to Redemption Value     (22,697,227)
Balance at Dec. 31, 2022 $ 187,364,894   $ 187,364,894
Balance, Shares at Dec. 31, 2022 2,650,000   2,650,000