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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, 2018     $ 316,828,837
Balance, Shares at Dec. 31, 2018     2,900,000
Purchases of Shares     $ 197,447,849
Purchases of Shares, Shares     1,850,000
Redemption of Shares     $ (248,252,458)
Redemption of Shares, Shares     (2,300,000)
Net Increase (Decrease) due to Share Transactions     $ (50,804,609)
Net Increase (Decrease) due to Share Transactions, Shares     (450,000)
Net Comprehensive Income (Loss) $ (1,435,121) $ (1,435,121)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,435,121 1,435,121 $ (1,435,121)
Adjustment of Redeemable Capital Shares to Redemption Value     (10,864,366)
Balance at Sep. 30, 2019     $ 253,724,741
Balance, Shares at Sep. 30, 2019     2,450,000
Balance at Jun. 30, 2019     $ 222,216,366
Balance, Shares at Jun. 30, 2019     2,050,000
Purchases of Shares     $ 84,609,381
Purchases of Shares, Shares     800,000
Redemption of Shares     $ (42,457,504)
Redemption of Shares, Shares     (400,000)
Net Increase (Decrease) due to Share Transactions     $ 42,151,877
Net Increase (Decrease) due to Share Transactions, Shares     400,000
Net Comprehensive Income (Loss) (475,453) (475,453)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 475,453 475,453 $ (475,453)
Adjustment of Redeemable Capital Shares to Redemption Value     (10,168,049)
Balance at Sep. 30, 2019     $ 253,724,741
Balance, Shares at Sep. 30, 2019     2,450,000
Balance at Dec. 31, 2019 $ 287,263,846   $ 287,263,846
Balance, Shares at Dec. 31, 2019 2,700,000   2,700,000
Purchases of Shares     $ 318,210,622
Purchases of Shares, Shares     2,950,000
Redemption of Shares     $ (270,204,291)
Redemption of Shares, Shares     (2,550,000)
Net Increase (Decrease) due to Share Transactions     $ 48,006,331
Net Increase (Decrease) due to Share Transactions, Shares     400,000
Net Comprehensive Income (Loss) $ (1,865,025) (1,865,025)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,865,025 1,865,025 $ (1,865,025)
Adjustment of Redeemable Capital Shares to Redemption Value     8,811,457
Balance at Sep. 30, 2020 $ 342,216,609   $ 342,216,609
Balance, Shares at Sep. 30, 2020 3,100,000   3,100,000
Balance at Jun. 30, 2020     $ 206,646,067
Balance, Shares at Jun. 30, 2020     1,950,000
Purchases of Shares     $ 199,309,922
Purchases of Shares, Shares     1,800,000
Redemption of Shares     $ (72,101,928)
Redemption of Shares, Shares     (650,000)
Net Increase (Decrease) due to Share Transactions     $ 127,207,994
Net Increase (Decrease) due to Share Transactions, Shares     1,150,000
Net Comprehensive Income (Loss) $ (722,810) (722,810)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 722,810 $ 722,810 $ (722,810)
Adjustment of Redeemable Capital Shares to Redemption Value     9,085,358
Balance at Sep. 30, 2020 $ 342,216,609   $ 342,216,609
Balance, Shares at Sep. 30, 2020 3,100,000   3,100,000