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Statements of Changes in Shareholders' Equity and Redeemable Capital Shares - USD ($)
Total
Retained Earnings
Redeemable Capital Shares
Balance at Oct. 31, 2017     $ 109,883,188
Balance, Shares at Oct. 31, 2017     1,300,000
Purchases of Shares, Shares     1,300,000
Purchases of Shares     $ 112,839,783
Redemption of Shares, Shares     (1,100,000)
Redemption of Shares     $ (95,396,862)
Net Increase (Decrease) due to Share Transactions     $ 17,442,921
Net Increase (Decrease) due to Share Transactions, Shares     200,000
Net Comprehensive Income (Loss) $ (704,433) $ (704,433)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 704,433 704,433 $ (704,433)
Adjustment of Redeemable Capital Shares to Redemption Value     398,913
Balance at Oct. 31, 2018     $ 127,020,589
Balance, Shares at Oct. 31, 2018     1,500,000
Purchases of Shares, Shares     500,000
Purchases of Shares     $ 42,358,199
Net Increase (Decrease) due to Share Transactions     $ 42,358,199
Net Increase (Decrease) due to Share Transactions, Shares     500,000
Net Comprehensive Income (Loss) (122,840) (122,840)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 122,840 122,840 $ (122,840)
Adjustment of Redeemable Capital Shares to Redemption Value     4,806,216
Balance at Dec. 31, 2018 $ 174,062,164   $ 174,062,164
Balance, Shares at Dec. 31, 2018 2,000,000   2,000,000
Purchases of Shares, Shares     4,000,000
Purchases of Shares     $ 349,348,608
Redemption of Shares, Shares     (3,800,000)
Redemption of Shares     $ (327,169,568)
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