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Statements of Changes in Shareholders' Equity and Redeemable Capital Shares - USD ($)
Total
Retained Earnings [Member]
Redeemable Capital Shares [Member]
Balance, Shares at Dec. 31, 2020     1,950,000
Balance at Dec. 31, 2020     $ 150,539,263
Purchases of Shares     $ 201,450,598
Purchases of Shares, Shares     2,550,000
Redemption of Shares     $ (209,787,288)
Redemption of Shares, Shares     (2,700,000)
Net Increase (Decrease) due to Share Transactions     $ (8,336,690)
Net Increase (Decrease) due to Share Transactions, shares     (150,000)
Net Comprehensive Income (Loss) $ (714,735) $ (714,735)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 714,735 714,735 $ (714,735)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (1,893,910)
Balance, Shares at Dec. 31, 2021 1,800,000   1,800,000
Balance at Dec. 31, 2021 $ 139,593,928   $ 139,593,928
Purchases of Shares     $ 55,762,786
Purchases of Shares, Shares     750,000
Redemption of Shares     $ (90,573,198)
Redemption of Shares, Shares     (1,200,000)
Net Increase (Decrease) due to Share Transactions     $ (34,810,412)
Net Increase (Decrease) due to Share Transactions, shares     (450,000)
Distributions (315,692) (315,692)  
Net Comprehensive Income (Loss) 146,701 146,701  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 168,991 $ 168,991 $ (168,991)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (7,121,076)
Balance, Shares at Dec. 31, 2022 1,350,000   1,350,000
Balance at Dec. 31, 2022 $ 97,493,449   $ 97,493,449