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Statements of Changes in Shareholders' Equity and Redeemable Capital Shares - USD ($)
Total
Retained Earnings
Redeemable Capital Shares
Balance at Dec. 31, 2017     $ 106,486,768
Balance, Shares at Dec. 31, 2017     1,250,000
Purchases of Shares $ 0    
Purchases of Shares, Shares     1,200,000
Purchases of Shares     $ 104,908,031
Redemption of Shares 0    
Redemption of Shares, Shares     (950,000)
Redemption of Shares     $ (82,959,702)
Net Increase (Decrease) due to Share Transactions 0   $ 21,948,329
Net Increase (Decrease) due to Share Transactions, Shares     250,000
Net Comprehensive Income (Loss) (558,466) $ (558,466)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 558,466 558,466 $ (558,466)
Adjustment of Redeemable Capital Shares to Redemption Value 0   (1,618,636)
Balance at Sep. 30, 2018     $ 126,257,995
Balance, Shares at Sep. 30, 2018     1,500,000
Balance at Jun. 30, 2018     $ 168,527,181
Balance, Shares at Jun. 30, 2018     1,950,000
Purchases of Shares 0    
Purchases of Shares, Shares     150,000
Purchases of Shares     $ 12,302,409
Redemption of Shares 0    
Redemption of Shares, Shares     (600,000)
Redemption of Shares     $ (52,105,821)
Net Increase (Decrease) due to Share Transactions 0   $ (39,803,412)
Net Increase (Decrease) due to Share Transactions, Shares     (450,000)
Net Comprehensive Income (Loss) (171,736) (171,736)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 171,736 171,736 $ (171,736)
Adjustment of Redeemable Capital Shares to Redemption Value 0   (2,294,038)
Balance at Sep. 30, 2018     $ 126,257,995
Balance, Shares at Sep. 30, 2018     1,500,000
Balance at Dec. 31, 2018 $ 174,062,164   $ 174,062,164
Balance, Shares at Dec. 31, 2018 2,000,000   2,000,000
Purchases of Shares $ 0    
Purchases of Shares, Shares     3,800,000
Purchases of Shares     $ 331,936,195
Redemption of Shares 0    
Redemption of Shares, Shares     (3,300,000)
Redemption of Shares     $ (283,381,686)
Net Increase (Decrease) due to Share Transactions 0   $ 48,554,509
Net Increase (Decrease) due to Share Transactions, Shares     500,000
Net Comprehensive Income (Loss) (856,042) (856,042)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 856,042 856,042 $ (856,042)
Adjustment of Redeemable Capital Shares to Redemption Value 0   (1,719,348)
Balance at Sep. 30, 2019 $ 220,041,283   $ 220,041,283
Balance, Shares at Sep. 30, 2019 2,500,000   2,500,000
Balance at Jun. 30, 2019     $ 216,584,710
Balance, Shares at Jun. 30, 2019     2,450,000
Purchases of Shares $ 0    
Purchases of Shares, Shares     350,000
Purchases of Shares     $ 30,973,922
Redemption of Shares 0    
Redemption of Shares, Shares     (300,000)
Redemption of Shares     $ (26,664,930)
Net Increase (Decrease) due to Share Transactions 0   $ 4,308,992
Net Increase (Decrease) due to Share Transactions, Shares     50,000
Net Comprehensive Income (Loss) (276,528) (276,528)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 276,528 $ 276,528 $ (276,528)
Adjustment of Redeemable Capital Shares to Redemption Value 0   (575,891)
Balance at Sep. 30, 2019 $ 220,041,283   $ 220,041,283
Balance, Shares at Sep. 30, 2019 2,500,000   2,500,000