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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, 2018     $ 174,062,164
Balance, Shares at Dec. 31, 2018     2,000,000
Purchases of Shares     $ 349,348,608
Purchases of Shares, Shares     4,000,000
Redemption of Shares     $ (327,169,568)
Redemption of Shares, Shares     (3,800,000)
Net Increase (Decrease) due to Share Transactions     $ 22,179,040
Net Increase (Decrease) due to Share Transactions, Shares     200,000
Net Comprehensive Income (Loss) $ (1,116,798) $ (1,116,798)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,116,798 1,116,798 $ (1,116,798)
Adjustment of Redeemable Capital Shares to Redemption Value     (2,817,905)
Balance at Dec. 31, 2019 $ 192,306,501   $ 192,306,501
Balance, Shares at Dec. 31, 2019 2,200,000   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