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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     $ 118,900,700
Purchases of Shares, Shares     1,150,000
Redemption of Shares     $ (198,102,363)
Redemption of Shares, Shares     (1,900,000)
Net Increase (Decrease) due to Share Transactions     $ (79,201,663)
Net Increase (Decrease) due to Share Transactions, Shares     (750,000)
Net Comprehensive Income (Loss) $ (1,142,215) $ (1,142,215)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,142,215 1,142,215 $ (1,142,215)
Adjustment of Redeemable Capital Shares to Redemption Value     (273,901)
Balance at Jun. 30, 2020     $ 206,646,067
Balance, Shares at Jun. 30, 2020     1,950,000
Balance at Mar. 31, 2020     $ 274,974,705
Balance, Shares at Mar. 31, 2020     2,650,000
Purchases of Shares     $ 41,336,623
Purchases of Shares, Shares     400,000
Redemption of Shares     $ (114,344,354)
Redemption of Shares, Shares     (1,100,000)
Net Increase (Decrease) due to Share Transactions     $ (73,007,731)
Net Increase (Decrease) due to Share Transactions, Shares     (700,000)
Net Comprehensive Income (Loss) (529,829) (529,829)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 529,829 529,829 $ (529,829)
Adjustment of Redeemable Capital Shares to Redemption Value     5,208,922
Balance at Jun. 30, 2020     $ 206,646,067
Balance, Shares at Jun. 30, 2020     1,950,000
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     $ 113,462,451
Purchases of Shares, Shares     1,000,000
Redemption of Shares     $ (135,478,655)
Redemption of Shares, Shares     (1,200,000)
Net Increase (Decrease) due to Share Transactions     $ (22,016,204)
Net Increase (Decrease) due to Share Transactions, Shares     (200,000)
Net Comprehensive Income (Loss) $ (1,509,159) (1,509,159)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,509,159 1,509,159 $ (1,509,159)
Adjustment of Redeemable Capital Shares to Redemption Value     (10,263,398)
Balance at Jun. 30, 2021 $ 293,727,749   $ 293,727,749
Balance, Shares at Jun. 30, 2021 2,650,000   2,650,000
Balance at Mar. 31, 2021     $ 308,394,596
Balance, Shares at Mar. 31, 2021     2,800,000
Purchases of Shares     $ 39,670,752
Purchases of Shares, Shares     350,000
Redemption of Shares     $ (56,242,584)
Redemption of Shares, Shares     (500,000)
Net Increase (Decrease) due to Share Transactions     $ (16,571,832)
Net Increase (Decrease) due to Share Transactions, Shares     (150,000)
Net Comprehensive Income (Loss) $ (761,609) (761,609)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 761,609 $ 761,609 $ (761,609)
Adjustment of Redeemable Capital Shares to Redemption Value     2,666,594
Balance at Jun. 30, 2021 $ 293,727,749   $ 293,727,749
Balance, Shares at Jun. 30, 2021 2,650,000   2,650,000