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Statement of Changes in Shareholders' Equity and Redeemable Capital Shares - USD ($)
Total
Retained Earnings [Member]
Redeemable Capital Shares [Member]
Balance at Dec. 31, 2019     $ 91,378,070
Balance, Shares at Dec. 31, 2019     1,300,000
Purchases of Shares     $ 81,647,198
Purchases of Shares, Shares     1,150,000
Redemption of Shares     $ (27,594,313)
Redemption of Shares, Shares     (400,000)
Net Increase (Decrease) due to Share Transactions     $ 54,052,885
Net Increase (Decrease) due to Share Transactions, Shares     750,000
Distributions $ (25,880) $ (25,880)  
Net Comprehensive Income (Loss) (398,350) (398,350)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 424,230 424,230 $ (424,230)
Adjustment of Redeemable Capital Shares to Redemption Value     12,604,373
Balance at Dec. 31, 2020 $ 157,611,098   $ 157,611,098
Balance, Shares at Dec. 31, 2020 2,050,000   2,050,000
Purchases of Shares     $ 11,566,005
Purchases of Shares, Shares     150,000
Redemption of Shares     $ (63,174,072)
Redemption of Shares, Shares     (850,000)
Net Increase (Decrease) due to Share Transactions     $ (51,608,067)
Net Increase (Decrease) due to Share Transactions, Shares     (700,000)
Net Comprehensive Income (Loss) $ (548,255) (548,255)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 548,255 $ 548,255 $ (548,255)
Adjustment of Redeemable Capital Shares to Redemption Value     (8,052,420)
Balance at Dec. 31, 2021 $ 97,402,356   $ 97,402,356
Balance, Shares at Dec. 31, 2021 1,350,000   1,350,000