Statements of Changes in Shareholders' Equity and Redeemable Capital Shares (Unaudited) - USD ($) | Total | Retained Earnings [Member] | Redeemable Capital Shares [Member] |
Balance, Shares at Dec. 31, 2018 | | | 1,850,000 |
Balance at Dec. 31, 2018 | | | $ 175,017,674 |
Purchases of Shares | | | $ 18,634,986 |
Purchases of Shares, Shares | | | 200,000 |
Redemption of Shares | | | $ (47,049,028) |
Redemption of Shares, Shares | | | (500,000) |
Net Increase (Decrease) due to Share Transactions | | | $ (28,414,042) |
Net Increase (Decrease) due to Share Transactions, Shares | | | (300,000) |
Net Comprehensive Income (Loss) | $ (881,238) | $ (881,238) | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | 881,238 | 881,238 | $ (881,238) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ 1,687,001 |
Balance, Shares at Jun. 30, 2019 | | | 1,550,000 |
Balance at Jun. 30, 2019 | | | $ 147,409,395 |
Balance, Shares at Mar. 31, 2019 | | | 1,600,000 |
Balance at Mar. 31, 2019 | | | $ 149,403,443 |
Purchases of Shares | | | $ 9,318,811 |
Purchases of Shares, Shares | | | 100,000 |
Redemption of Shares | | | $ (14,181,989) |
Redemption of Shares, Shares | | | (150,000) |
Net Increase (Decrease) due to Share Transactions | | | $ (4,863,178) |
Net Increase (Decrease) due to Share Transactions, Shares | | | (50,000) |
Net Comprehensive Income (Loss) | (430,071) | (430,071) | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | $ 430,071 | 430,071 | $ (430,071) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ 3,299,201 |
Balance, Shares at Jun. 30, 2019 | | | 1,550,000 |
Balance at Jun. 30, 2019 | | | $ 147,409,395 |
Balance, Shares at Dec. 31, 2019 | 1,400,000 | | 1,400,000 |
Balance at Dec. 31, 2019 | | | $ 133,273,946 |
Purchases of Shares | | | $ 137,592,460 |
Purchases of Shares, Shares | | | 1,450,000 |
Redemption of Shares | | | $ (101,057,034) |
Redemption of Shares, Shares | | | (1,050,000) |
Net Increase (Decrease) due to Share Transactions | | | $ 36,535,426 |
Net Increase (Decrease) due to Share Transactions, Shares | | | 400,000 |
Net Comprehensive Income (Loss) | $ (930,580) | (930,580) | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | $ 930,580 | 930,580 | $ (930,580) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ 5,236,765 |
Balance, Shares at Jun. 30, 2020 | 1,800,000 | | 1,800,000 |
Balance at Jun. 30, 2020 | | | $ 174,115,557 |
Balance, Shares at Mar. 31, 2020 | | | 1,450,000 |
Balance at Mar. 31, 2020 | | | $ 137,750,080 |
Purchases of Shares | | | $ 108,958,466 |
Purchases of Shares, Shares | | | 1,150,000 |
Redemption of Shares | | | $ (77,010,710) |
Redemption of Shares, Shares | | | (800,000) |
Net Increase (Decrease) due to Share Transactions | | | $ 31,947,756 |
Net Increase (Decrease) due to Share Transactions, Shares | | | 350,000 |
Net Comprehensive Income (Loss) | $ (528,172) | (528,172) | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | $ 528,172 | $ 528,172 | $ (528,172) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ 4,945,893 |
Balance, Shares at Jun. 30, 2020 | 1,800,000 | | 1,800,000 |
Balance at Jun. 30, 2020 | | | $ 174,115,557 |