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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, 2018     $ 174,062,164
Balance, Shares at Dec. 31, 2018     2,000,000
Purchases of Shares $ 0    
Purchases of Shares, Shares     3,450,000
Purchases of Shares     $ 300,962,273
Redemption of Shares 0    
Redemption of Shares, Shares     (3,000,000)
Redemption of Shares     $ (256,716,756)
Net Increase (Decrease) due to Share Transactions 0   $ 44,245,517
Net Increase (Decrease) due to Share Transactions, Shares     450,000
Net Comprehensive Income (Loss) (579,514) $ (579,514)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 579,514 579,514 $ (579,514)
Adjustment of Redeemable Capital Shares to Redemption Value 0   (1,143,457)
Balance at Jun. 30, 2019     $ 216,584,710
Balance, Shares at Jun. 30, 2019     2,450,000
Balance at Mar. 31, 2019     $ 176,622,178
Balance, Shares at Mar. 31, 2019     2,050,000
Purchases of Shares 0    
Purchases of Shares, Shares     700,000
Purchases of Shares     $ 61,028,022
Redemption of Shares 0    
Redemption of Shares, Shares     (300,000)
Redemption of Shares     $ (25,944,718)
Net Increase (Decrease) due to Share Transactions 0   $ 35,083,304
Net Increase (Decrease) due to Share Transactions, Shares     400,000
Net Comprehensive Income (Loss) (233,695) (233,695)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 233,695 233,695 $ (233,695)
Adjustment of Redeemable Capital Shares to Redemption Value 0   5,112,923
Balance at Jun. 30, 2019     $ 216,584,710
Balance, Shares at Jun. 30, 2019     2,450,000
Balance at Dec. 31, 2019 $ 192,306,501   $ 192,306,501
Balance, Shares at Dec. 31, 2019 2,200,000   2,200,000
Purchases of Shares $ 0    
Purchases of Shares, Shares     2,200,000
Purchases of Shares     $ 192,570,516
Redemption of Shares 0    
Redemption of Shares, Shares     (1,600,000)
Redemption of Shares     $ (138,910,868)
Net Increase (Decrease) due to Share Transactions 0   $ 53,659,648
Net Increase (Decrease) due to Share Transactions, Shares     600,000
Net Comprehensive Income (Loss) (703,051) (703,051)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 703,051 703,051 $ (703,051)
Adjustment of Redeemable Capital Shares to Redemption Value 0   539,825
Balance at Jun. 30, 2020 $ 245,802,923   $ 245,802,923
Balance, Shares at Jun. 30, 2020 2,800,000   2,800,000
Balance at Mar. 31, 2020     $ 232,836,075
Balance, Shares at Mar. 31, 2020     2,650,000
Purchases of Shares $ 0    
Purchases of Shares, Shares     1,000,000
Purchases of Shares     $ 87,256,470
Redemption of Shares 0    
Redemption of Shares, Shares     (850,000)
Redemption of Shares     $ (75,012,206)
Net Increase (Decrease) due to Share Transactions 0   $ 12,244,264
Net Increase (Decrease) due to Share Transactions, Shares     150,000
Net Comprehensive Income (Loss) (391,347) (391,347)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 391,347 $ 391,347 $ (391,347)
Adjustment of Redeemable Capital Shares to Redemption Value 0   1,113,931
Balance at Jun. 30, 2020 $ 245,802,923   $ 245,802,923
Balance, Shares at Jun. 30, 2020 2,800,000   2,800,000