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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     $ 62,236,681
Purchases of Shares, Shares     800,000
Redemption of Shares     $ (35,159,184)
Redemption of Shares, Shares     (450,000)
Net Increase (Decrease) due to Share Transactions     $ 27,077,497
Net Increase (Decrease) due to Share Transactions, shares     350,000
Net Comprehensive Income (Loss) $ (168,930) $ (168,930)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 168,930 168,930 $ (168,930)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 2,357,342
Balance, Shares at Mar. 31, 2021     2,300,000
Balance at Mar. 31, 2021     $ 179,805,172
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     $ 15,373,766
Purchases of Shares, Shares     200,000
Redemption of Shares     $ (23,299,351)
Redemption of Shares, Shares     (300,000)
Net Increase (Decrease) due to Share Transactions     $ (7,925,585)
Net Increase (Decrease) due to Share Transactions, shares     (100,000)
Net Comprehensive Income (Loss) (137,611) (137,611)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 137,611 $ 137,611 $ (137,611)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 1,664,849
Balance, Shares at Mar. 31, 2022 1,700,000   1,700,000
Balance at Mar. 31, 2022 $ 133,195,581   $ 133,195,581