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 | | | $ 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 |
Balance, Shares at Sep. 30, 2021 | | | 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 |
Balance, Shares at Sep. 30, 2021 | | | 2,700,000 |
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 | | | $ 525,443,080 |
Purchases of Shares, Shares | | | 5,450,000 |
Redemption of Shares | | | $ (310,397,616) |
Redemption of Shares, Shares | | | (3,150,000) |
Net Increase (Decrease) due to Share Transactions | | | $ 215,045,464 |
Net Increase (Decrease) due to Share Transactions, Shares | | | 2,300,000 |
Net Comprehensive Income (Loss) | $ (1,759,036) | (1,759,036) | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | 1,759,036 | 1,759,036 | $ (1,759,036) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | (35,933,408) |
Balance at Sep. 30, 2022 | $ 388,796,900 | | $ 388,796,900 |
Balance, Shares at Sep. 30, 2022 | 4,300,000 | | 4,300,000 |
Balance at Jun. 30, 2022 | | | $ 217,533,160 |
Balance, Shares at Jun. 30, 2022 | | | 2,250,000 |
Purchases of Shares | | | $ 269,622,294 |
Purchases of Shares, Shares | | | 2,900,000 |
Redemption of Shares | | | $ (78,754,630) |
Redemption of Shares, Shares | | | (850,000) |
Net Increase (Decrease) due to Share Transactions | | | $ 190,867,664 |
Net Increase (Decrease) due to Share Transactions, Shares | | | 2,050,000 |
Net Comprehensive Income (Loss) | $ (635,137) | (635,137) | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | 635,137 | $ 635,137 | $ (635,137) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | (18,968,787) |
Balance at Sep. 30, 2022 | $ 388,796,900 | | $ 388,796,900 |
Balance, Shares at Sep. 30, 2022 | 4,300,000 | | 4,300,000 |