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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, 2017     $ 271,881,278
Balance, Shares at Dec. 31, 2017     2,350,000
Purchases of Shares     $ 419,225,042
Purchases of Shares, Shares     3,600,000
Redemption of Shares     $ (413,171,649)
Redemption of Shares, Shares     (3,550,000)
Net Increase (Decrease) due to Share Transactions     $ 6,053,393
Net Increase (Decrease) due to Share Transactions, Shares     50,000
Net Comprehensive Income (Loss) $ (1,349,266) $ (1,349,266)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,349,266 1,349,266 $ (1,349,266)
Adjustment of Redeemable Capital Shares to Redemption Value     (7,694,480)
Balance at Jun. 30, 2018     $ 268,890,925
Balance, Shares at Jun. 30, 2018     2,400,000
Balance at Mar. 31, 2018     $ 342,937,967
Balance, Shares at Mar. 31, 2018     2,900,000
Purchases of Shares     $ 135,238,590
Purchases of Shares, Shares     1,200,000
Redemption of Shares     $ (194,267,891)
Redemption of Shares, Shares     (1,700,000)
Net Increase (Decrease) due to Share Transactions     $ (59,029,301)
Net Increase (Decrease) due to Share Transactions, Shares     (500,000)
Net Comprehensive Income (Loss) (695,972) (695,972)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 695,972 695,972 $ (695,972)
Adjustment of Redeemable Capital Shares to Redemption Value     (14,321,769)
Balance at Jun. 30, 2018     $ 268,890,925
Balance, Shares at Jun. 30, 2018     2,400,000
Balance at Dec. 31, 2018 $ 316,828,837   $ 316,828,837
Balance, Shares at Dec. 31, 2018 2,900,000   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   $ 222,216,366
Balance, Shares at Jun. 30, 2019 2,050,000   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   $ 222,216,366
Balance, Shares at Jun. 30, 2019 2,050,000   2,050,000