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 | | | 2,250,000 |
Temporary Equity, Balance at Dec. 31, 2018 | | | $ 162,583,352 |
Purchases of Shares | | | $ 36,961,166 |
Purchases of Shares, Shares | | | 500,000 |
Redemption of Shares | | | $ (74,136,784) |
Redemption of Shares, Shares | | | (1,000,000) |
Net Increase (Decrease) due to Share Transactions | | | $ (37,175,618) |
Net Increase (Decrease) due to Share Transactions, Shares | | | (500,000) |
Distributions | $ (503,643) | $ (503,643) | |
Net Comprehensive Income (Loss) | 524,338 | 524,338 | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | (20,695) | (20,695) | $ 20,695 |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ 6,758,060 |
Balance, Shares at Jun. 30, 2019 | | | 1,750,000 |
Temporary Equity, Balance at Jun. 30, 2019 | | | $ 132,186,489 |
Balance, Shares at Mar. 31, 2019 | | | 1,750,000 |
Temporary Equity, Balance at Mar. 31, 2019 | | | $ 129,300,360 |
Purchases of Shares | | | $ 18,459,923 |
Purchases of Shares, Shares | | | 250,000 |
Redemption of Shares | | | $ (18,387,663) |
Redemption of Shares, Shares | | | (250,000) |
Net Increase (Decrease) due to Share Transactions | | | $ 72,260 |
Distributions | (246,634) | (246,634) | |
Net Comprehensive Income (Loss) | 244,462 | 244,462 | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | $ 2,172 | 2,172 | (2,172) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ 2,816,041 |
Balance, Shares at Jun. 30, 2019 | | | 1,750,000 |
Temporary Equity, Balance at Jun. 30, 2019 | | | $ 132,186,489 |
Balance, Shares at Dec. 31, 2019 | 1,550,000 | | 1,550,000 |
Temporary Equity, Balance at Dec. 31, 2019 | $ 117,963,792 | | $ 117,963,792 |
Purchases of Shares | | | $ 32,129,693 |
Purchases of Shares, Shares | | | 450,000 |
Redemption of Shares | | | $ (32,465,014) |
Redemption of Shares, Shares | | | (450,000) |
Net Increase (Decrease) due to Share Transactions | | | $ (335,321) |
Distributions | (235,745) | (235,745) | |
Net Comprehensive Income (Loss) | 73,421 | 73,421 | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | $ 162,324 | 162,324 | (162,324) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ (5,313,108) |
Balance, Shares at Jun. 30, 2020 | 1,550,000 | | 1,550,000 |
Temporary Equity, Balance at Jun. 30, 2020 | $ 112,153,039 | | $ 112,153,039 |
Balance, Shares at Mar. 31, 2020 | | | 1,650,000 |
Temporary Equity, Balance at Mar. 31, 2020 | | | $ 114,356,721 |
Purchases of Shares | | | $ 14,324,353 |
Purchases of Shares, Shares | | | 200,000 |
Redemption of Shares | | | $ (21,519,743) |
Redemption of Shares, Shares | | | (300,000) |
Net Increase (Decrease) due to Share Transactions | | | $ (7,195,390) |
Net Increase (Decrease) due to Share Transactions, Shares | | | (100,000) |
Net Comprehensive Income (Loss) | (109,564) | (109,564) | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | $ 109,564 | $ 109,564 | $ (109,564) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ 5,101,272 |
Balance, Shares at Jun. 30, 2020 | 1,550,000 | | 1,550,000 |
Temporary Equity, Balance at Jun. 30, 2020 | $ 112,153,039 | | $ 112,153,039 |