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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     $ 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
Balance, Shares at Sep. 30, 2020     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
Balance, Shares at Sep. 30, 2020     3,100,000
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     $ 157,363,731
Purchases of Shares, Shares     1,400,000
Redemption of Shares     $ (173,927,554)
Redemption of Shares, Shares     (1,550,000)
Net Increase (Decrease) due to Share Transactions     $ (16,563,823)
Net Increase (Decrease) due to Share Transactions, Shares     (150,000)
Net Comprehensive Income (Loss) $ (2,282,087) (2,282,087)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 2,282,087 2,282,087 $ (2,282,087)
Adjustment of Redeemable Capital Shares to Redemption Value     (16,981,948)
Balance at Sep. 30, 2021 $ 291,688,652   $ 291,688,652
Balance, Shares at Sep. 30, 2021 2,700,000   2,700,000
Balance at Jun. 30, 2021     $ 293,727,749
Balance, Shares at Jun. 30, 2021     2,650,000
Purchases of Shares     $ 43,901,280
Purchases of Shares, Shares     400,000
Redemption of Shares     $ (38,448,899)
Redemption of Shares, Shares     (350,000)
Net Increase (Decrease) due to Share Transactions     $ 5,452,381
Net Increase (Decrease) due to Share Transactions, Shares     50,000
Net Comprehensive Income (Loss) $ (772,928) (772,928)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 772,928 $ 772,928 $ (772,928)
Adjustment of Redeemable Capital Shares to Redemption Value     (6,718,550)
Balance at Sep. 30, 2021 $ 291,688,652   $ 291,688,652
Balance, Shares at Sep. 30, 2021 2,700,000   2,700,000