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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, 2019     $ 287,263,846
Balance, Shares at Dec. 31, 2019     2,700,000
Purchases of Shares     $ 77,564,077
Purchases of Shares, Shares     750,000
Redemption of Shares     $ (83,758,009)
Redemption of Shares, Shares     (800,000)
Net Increase (Decrease) due to Share Transactions     $ (6,193,932)
Net Increase (Decrease) due to Share Transactions, Shares     (50,000)
Net Comprehensive Income (Loss) $ (612,386) $ (612,386)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 612,386 612,386 $ (612,386)
Adjustment of Redeemable Capital Shares to Redemption Value     (5,482,823)
Balance at Mar. 31, 2020     $ 274,974,705
Balance, Shares at Mar. 31, 2020     2,650,000
Balance at Dec. 31, 2020 $ 327,516,510   $ 327,516,510
Balance, Shares at Dec. 31, 2020 2,850,000   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   $ 308,394,596
Balance, Shares at Mar. 31, 2021 2,800,000   2,800,000