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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, 2019     $ 192,306,501
Balance, Shares at Dec. 31, 2019     2,200,000
Purchases of Shares     $ 105,314,046
Purchases of Shares, Shares     1,200,000
Redemption of Shares     $ (63,898,662)
Redemption of Shares, Shares     (750,000)
Net Increase (Decrease) due to Share Transactions     $ 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     (574,106)
Balance at Mar. 31, 2020     $ 232,836,075
Balance, Shares at Mar. 31, 2020     2,650,000
Balance at Dec. 31, 2020 $ 246,926,201   $ 246,926,201
Balance, Shares at Dec. 31, 2020 2,700,000   2,700,000
Purchases of Shares     $ 4,541,369
Purchases of Shares, Shares     50,000
Redemption of Shares     $ (48,242,779)
Redemption of Shares, Shares     (550,000)
Net Increase (Decrease) due to Share Transactions     $ (43,701,410)
Net Increase (Decrease) due to Share Transactions, Shares     (500,000)
Net Comprehensive Income (Loss) $ (337,688) (337,688)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 337,688 $ 337,688 $ (337,688)
Adjustment of Redeemable Capital Shares to Redemption Value     (15,179,005)
Balance at Mar. 31, 2021 $ 187,708,098   $ 187,708,098
Balance, Shares at Mar. 31, 2021 2,200,000   2,200,000