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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     $ 73,791,699
Purchases of Shares, Shares     650,000
Redemption of Shares     $ (79,236,071)
Redemption of Shares, Shares     (700,000)
Net Increase (Decrease) due to Share Transactions     $ (5,444,372)
Net Increase (Decrease) due to Share Transactions, Shares     (50,000)
Net Comprehensive Income (Loss) $ (747,550) $ (747,550)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 747,550 747,550 $ (747,550)
Adjustment of Redeemable Capital Shares to Redemption Value     (12,929,992)
Balance at Mar. 31, 2021     $ 308,394,596
Balance, Shares at Mar. 31, 2021     2,800,000
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     $ 89,158,392
Purchases of Shares, Shares     850,000
Redemption of Shares     $ (108,633,073)
Redemption of Shares, Shares     (1,050,000)
Net Increase (Decrease) due to Share Transactions     $ (19,474,681)
Net Increase (Decrease) due to Share Transactions, Shares     (200,000)
Net Comprehensive Income (Loss) $ (527,541) (527,541)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 527,541 $ 527,541 $ (527,541)
Adjustment of Redeemable Capital Shares to Redemption Value     (5,739,486)
Balance at Mar. 31, 2022 $ 185,702,172   $ 185,702,172
Balance, Shares at Mar. 31, 2022 1,800,000   1,800,000