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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, 2018     $ 316,828,837
Balance, Shares at Dec. 31, 2018     2,900,000
Purchases of Shares     $ 112,838,468
Purchases of Shares, Shares     1,050,000
Redemption of Shares     $ (205,804,240)
Redemption of Shares, Shares     (1,900,000)
Net Increase (Decrease) due to Share Transactions     $ (92,965,772)
Net Increase (Decrease) due to Share Transactions, Shares     (850,000)
Net Comprehensive Income (Loss) $ (959,668) $ (959,668)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 959,668 959,668 $ (959,668)
Adjustment of Redeemable Capital Shares to Redemption Value     (687,031)
Balance at Jun. 30, 2019     $ 222,216,366
Balance, Shares at Jun. 30, 2019     2,050,000
Balance at Mar. 31, 2019     $ 219,547,035
Balance, Shares at Mar. 31, 2019     2,050,000
Purchases of Shares     $ 69,557,423
Purchases of Shares, Shares     650,000
Redemption of Shares     $ (69,735,135)
Redemption of Shares, Shares     (650,000)
Net Increase (Decrease) due to Share Transactions     $ (177,712)
Net Comprehensive Income (Loss) (469,408) (469,408)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 469,408 469,408 (469,408)
Adjustment of Redeemable Capital Shares to Redemption Value     3,316,451
Balance at Jun. 30, 2019     $ 222,216,366
Balance, Shares at Jun. 30, 2019     2,050,000
Balance at Dec. 31, 2019 $ 287,263,846   $ 287,263,846
Balance, Shares at Dec. 31, 2019 2,700,000   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   $ 206,646,067
Balance, Shares at Jun. 30, 2020 1,950,000   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   $ 206,646,067
Balance, Shares at Jun. 30, 2020 1,950,000   1,950,000