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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, Shares at Dec. 31, 2020     1,950,000
Balance at Dec. 31, 2020     $ 150,539,263
Purchases of Shares     $ 130,131,963
Purchases of Shares, Shares     1,650,000
Redemption of Shares     $ (75,016,335)
Redemption of Shares, Shares     (950,000)
Net Increase (Decrease) due to Share Transactions     $ 55,115,628
Net Increase (Decrease) due to Share Transactions, shares     700,000
Net Comprehensive Income (Loss) $ (347,997) $ (347,997)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 347,997 347,997 $ (347,997)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 4,753,977
Balance, Shares at Jun. 30, 2021     2,650,000
Balance at Jun. 30, 2021     $ 210,060,871
Balance, Shares at Mar. 31, 2021     2,300,000
Balance at Mar. 31, 2021     $ 179,805,172
Purchases of Shares     $ 67,895,282
Purchases of Shares, Shares     850,000
Redemption of Shares     $ (39,857,151)
Redemption of Shares, Shares     (500,000)
Net Increase (Decrease) due to Share Transactions     $ 28,038,131
Net Increase (Decrease) due to Share Transactions, shares     350,000
Net Comprehensive Income (Loss) (179,067) (179,067)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 179,067 179,067 $ (179,067)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 2,396,635
Balance, Shares at Jun. 30, 2021     2,650,000
Balance at Jun. 30, 2021     $ 210,060,871
Balance, Shares at Dec. 31, 2021 1,800,000   1,800,000
Balance at Dec. 31, 2021 $ 139,593,928   $ 139,593,928
Purchases of Shares     $ 19,151,146
Purchases of Shares, Shares     250,000
Redemption of Shares     $ (57,727,353)
Redemption of Shares, Shares     (750,000)
Net Increase (Decrease) due to Share Transactions     $ (38,576,207)
Net Increase (Decrease) due to Share Transactions, shares     (500,000)
Net Comprehensive Income (Loss) (259,802) (259,802)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 259,802 259,802 $ (259,802)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (2,230,358)
Balance, Shares at Jun. 30, 2022 1,300,000   1,300,000
Balance at Jun. 30, 2022 $ 98,527,561   $ 98,527,561
Balance, Shares at Mar. 31, 2022     1,700,000
Balance at Mar. 31, 2022     $ 133,195,581
Purchases of Shares     $ 3,777,380
Purchases of Shares, Shares     50,000
Redemption of Shares     $ (34,428,002)
Redemption of Shares, Shares     (450,000)
Net Increase (Decrease) due to Share Transactions     $ (30,650,622)
Net Increase (Decrease) due to Share Transactions, shares     (400,000)
Net Comprehensive Income (Loss) (122,191) (122,191)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 122,191 $ 122,191 $ (122,191)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (3,895,207)
Balance, Shares at Jun. 30, 2022 1,300,000   1,300,000
Balance at Jun. 30, 2022 $ 98,527,561   $ 98,527,561