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 | | | $ 51,850,144 |
Purchases of Shares, Shares | | | 700,000 |
Redemption of Shares | | | $ (103,973,357) |
Redemption of Shares, Shares | | | (1,400,000) |
Net Increase (Decrease) due to Share Transactions | | | $ (52,123,213) |
Net Increase (Decrease) due to Share Transactions, Shares | | | (700,000) |
Distributions | $ (753,725) | $ (753,725) | |
Net Comprehensive Income (Loss) | 753,436 | 753,436 | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | 289 | 289 | $ (289) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ 5,079,863 |
Balance, Shares at Sep. 30, 2019 | | | 1,550,000 |
Temporary Equity, Balance at Sep. 30, 2019 | | | $ 115,539,713 |
Balance, Shares at Jun. 30, 2019 | | | 1,750,000 |
Temporary Equity, Balance at Jun. 30, 2019 | | | $ 132,186,489 |
Purchases of Shares | | | $ 14,888,978 |
Purchases of Shares, Shares | | | 200,000 |
Redemption of Shares | | | $ (29,836,573) |
Redemption of Shares, Shares | | | (400,000) |
Net Increase (Decrease) due to Share Transactions | | | $ (14,947,595) |
Net Increase (Decrease) due to Share Transactions, Shares | | | (200,000) |
Distributions | (250,082) | (250,082) | |
Net Comprehensive Income (Loss) | 229,098 | 229,098 | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | $ 20,984 | 20,984 | $ (20,984) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ (1,678,197) |
Balance, Shares at Sep. 30, 2019 | | | 1,550,000 |
Temporary Equity, Balance at Sep. 30, 2019 | | | $ 115,539,713 |
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 | | | $ 54,351,901 |
Purchases of Shares, Shares | | | 750,000 |
Redemption of Shares | | | $ (32,465,014) |
Redemption of Shares, Shares | | | (450,000) |
Net Increase (Decrease) due to Share Transactions | | | $ 21,886,887 |
Net Increase (Decrease) due to Share Transactions, Shares | | | 300,000 |
Distributions | (235,745) | (235,745) | |
Net Comprehensive Income (Loss) | (54,661) | (54,661) | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | $ 290,406 | 290,406 | $ (290,406) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ (3,206,213) |
Balance, Shares at Sep. 30, 2020 | 1,850,000 | | 1,850,000 |
Temporary Equity, Balance at Sep. 30, 2020 | $ 136,354,060 | | $ 136,354,060 |
Balance, Shares at Jun. 30, 2020 | | | 1,550,000 |
Temporary Equity, Balance at Jun. 30, 2020 | | | $ 112,153,039 |
Purchases of Shares | | | $ 22,222,208 |
Purchases of Shares, Shares | | | 300,000 |
Net Increase (Decrease) due to Share Transactions | | | $ 22,222,208 |
Net Increase (Decrease) due to Share Transactions, Shares | | | 300,000 |
Net Comprehensive Income (Loss) | (128,082) | (128,082) | |
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings | $ 128,082 | $ 128,082 | $ (128,082) |
Adjustment of Redeemable Capital Shares to Redemption Value | | | $ 2,106,895 |
Balance, Shares at Sep. 30, 2020 | 1,850,000 | | 1,850,000 |
Temporary Equity, Balance at Sep. 30, 2020 | $ 136,354,060 | | $ 136,354,060 |