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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, 2020     $ 327,516,510
Balance, Shares at Dec. 31, 2020     2,850,000
Purchases of Shares     $ 157,363,731
Purchases of Shares, Shares     1,400,000
Redemption of Shares     $ (173,927,554)
Redemption of Shares, Shares     (1,550,000)
Net Increase (Decrease) due to Share Transactions     $ (16,563,823)
Net Increase (Decrease) due to Share Transactions, Shares     (150,000)
Net Comprehensive Income (Loss) $ (2,282,087) $ (2,282,087)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 2,282,087 2,282,087 $ (2,282,087)
Adjustment of Redeemable Capital Shares to Redemption Value     (16,981,948)
Balance at Sep. 30, 2021     $ 291,688,652
Balance, Shares at Sep. 30, 2021     2,700,000
Balance at Jun. 30, 2021     $ 293,727,749
Balance, Shares at Jun. 30, 2021     2,650,000
Purchases of Shares     $ 43,901,280
Purchases of Shares, Shares     400,000
Redemption of Shares     $ (38,448,899)
Redemption of Shares, Shares     (350,000)
Net Increase (Decrease) due to Share Transactions     $ 5,452,381
Net Increase (Decrease) due to Share Transactions, Shares     50,000
Net Comprehensive Income (Loss) (772,928) (772,928)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 772,928 772,928 $ (772,928)
Adjustment of Redeemable Capital Shares to Redemption Value     (6,718,550)
Balance at Sep. 30, 2021     $ 291,688,652
Balance, Shares at Sep. 30, 2021     2,700,000
Balance at Dec. 31, 2021 $ 211,443,880   $ 211,443,880
Balance, Shares at Dec. 31, 2021 2,000,000   2,000,000
Purchases of Shares     $ 525,443,080
Purchases of Shares, Shares     5,450,000
Redemption of Shares     $ (310,397,616)
Redemption of Shares, Shares     (3,150,000)
Net Increase (Decrease) due to Share Transactions     $ 215,045,464
Net Increase (Decrease) due to Share Transactions, Shares     2,300,000
Net Comprehensive Income (Loss) $ (1,759,036) (1,759,036)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,759,036 1,759,036 $ (1,759,036)
Adjustment of Redeemable Capital Shares to Redemption Value     (35,933,408)
Balance at Sep. 30, 2022 $ 388,796,900   $ 388,796,900
Balance, Shares at Sep. 30, 2022 4,300,000   4,300,000
Balance at Jun. 30, 2022     $ 217,533,160
Balance, Shares at Jun. 30, 2022     2,250,000
Purchases of Shares     $ 269,622,294
Purchases of Shares, Shares     2,900,000
Redemption of Shares     $ (78,754,630)
Redemption of Shares, Shares     (850,000)
Net Increase (Decrease) due to Share Transactions     $ 190,867,664
Net Increase (Decrease) due to Share Transactions, Shares     2,050,000
Net Comprehensive Income (Loss) $ (635,137) (635,137)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 635,137 $ 635,137 $ (635,137)
Adjustment of Redeemable Capital Shares to Redemption Value     (18,968,787)
Balance at Sep. 30, 2022 $ 388,796,900   $ 388,796,900
Balance, Shares at Sep. 30, 2022 4,300,000   4,300,000