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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     $ 113,462,451
Purchases of Shares, Shares     1,000,000
Redemption of Shares     $ (135,478,655)
Redemption of Shares, Shares     (1,200,000)
Net Increase (Decrease) due to Share Transactions     $ (22,016,204)
Net Increase (Decrease) due to Share Transactions, Shares     (200,000)
Net Comprehensive Income (Loss) $ (1,509,159) $ (1,509,159)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,509,159 1,509,159 $ (1,509,159)
Adjustment of Redeemable Capital Shares to Redemption Value     (10,263,398)
Balance at Jun. 30, 2021     $ 293,727,749
Balance, Shares at Jun. 30, 2021     2,650,000
Balance at Mar. 31, 2021     $ 308,394,596
Balance, Shares at Mar. 31, 2021     2,800,000
Purchases of Shares     $ 39,670,752
Purchases of Shares, Shares     350,000
Redemption of Shares     $ (56,242,584)
Redemption of Shares, Shares     (500,000)
Net Increase (Decrease) due to Share Transactions     $ (16,571,832)
Net Increase (Decrease) due to Share Transactions, Shares     (150,000)
Net Comprehensive Income (Loss) (761,609) (761,609)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 761,609 761,609 $ (761,609)
Adjustment of Redeemable Capital Shares to Redemption Value     2,666,594
Balance at Jun. 30, 2021     $ 293,727,749
Balance, Shares at Jun. 30, 2021     2,650,000
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     $ 255,820,786
Purchases of Shares, Shares     2,550,000
Redemption of Shares     $ (231,642,986)
Redemption of Shares, Shares     (2,300,000)
Net Increase (Decrease) due to Share Transactions     $ 24,177,800
Net Increase (Decrease) due to Share Transactions, Shares     250,000
Net Comprehensive Income (Loss) $ (1,123,899) (1,123,899)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,123,899 1,123,899 $ (1,123,899)
Adjustment of Redeemable Capital Shares to Redemption Value     (16,964,621)
Balance at Jun. 30, 2022 $ 217,533,160   $ 217,533,160
Balance, Shares at Jun. 30, 2022 2,250,000   2,250,000
Balance at Mar. 31, 2022     $ 185,702,172
Balance, Shares at Mar. 31, 2022     1,800,000
Purchases of Shares     $ 166,662,394
Purchases of Shares, Shares     1,700,000
Redemption of Shares     $ (123,009,913)
Redemption of Shares, Shares     (1,250,000)
Net Increase (Decrease) due to Share Transactions     $ 43,652,481
Net Increase (Decrease) due to Share Transactions, Shares     450,000
Net Comprehensive Income (Loss) $ (596,358) (596,358)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 596,358 $ 596,358 $ (596,358)
Adjustment of Redeemable Capital Shares to Redemption Value     (11,225,135)
Balance at Jun. 30, 2022 $ 217,533,160   $ 217,533,160
Balance, Shares at Jun. 30, 2022 2,250,000   2,250,000