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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, 2019     $ 192,306,501
Balance, Shares at Dec. 31, 2019     2,200,000
Purchases of Shares     $ 228,333,778
Purchases of Shares, Shares     2,600,000
Redemption of Shares     $ (183,671,183)
Redemption of Shares, Shares     (2,100,000)
Net Increase (Decrease) due to Share Transactions     $ 44,662,595
Net Increase (Decrease) due to Share Transactions, Shares     500,000
Net Comprehensive Income (Loss) $ (1,464,432) $ (1,464,432)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,464,432 1,464,432 $ (1,464,432)
Adjustment of Redeemable Capital Shares to Redemption Value     11,421,537
Balance at Dec. 31, 2020 $ 246,926,201   $ 246,926,201
Balance, Shares at Dec. 31, 2020 2,700,000   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