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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     2,750,000
Purchases of Shares     $ 239,934,251
Redemption of Shares 0    
Redemption of Shares, Shares     (2,700,000)
Redemption of Shares     $ (230,772,038)
Net Increase (Decrease) due to Share Transactions 0   $ 9,162,213
Net Increase (Decrease) due to Share Transactions, Shares     50,000
Net Comprehensive Income (Loss) (345,819) $ (345,819)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 345,819 345,819 $ (345,819)
Adjustment of Redeemable Capital Shares to Redemption Value 0   (6,256,380)
Balance at Mar. 31, 2019     $ 176,622,178
Balance, Shares at Mar. 31, 2019     2,050,000
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     1,200,000
Purchases of Shares     $ 105,314,046
Redemption of Shares 0    
Redemption of Shares, Shares     (750,000)
Redemption of Shares     $ (63,898,662)
Net Increase (Decrease) due to Share Transactions 0   $ 41,415,384
Net Increase (Decrease) due to Share Transactions, Shares     450,000
Net Comprehensive Income (Loss) (311,704) (311,704)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 311,704 $ 311,704 $ (311,704)
Adjustment of Redeemable Capital Shares to Redemption Value 0   (574,106)
Balance at Mar. 31, 2020 $ 232,836,075   $ 232,836,075
Balance, Shares at Mar. 31, 2020 2,650,000   2,650,000