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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, 2019     1,550,000
Balance at Dec. 31, 2019     $ 117,963,792
Purchases of Shares     $ 73,499,173
Purchases of Shares, Shares     1,000,000
Redemption of Shares     $ (43,761,943)
Redemption of Shares, Shares     (600,000)
Net Increase (Decrease) due to Share Transactions     $ 29,737,230
Net Increase (Decrease) due to Share Transactions, shares     400,000
Distributions $ (235,745) $ (235,745)  
Net Comprehensive Income (Loss) (195,074) (195,074)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 430,819 430,819 $ (430,819)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 3,269,060
Balance, Shares at Dec. 31, 2020 1,950,000   1,950,000
Balance at Dec. 31, 2020 $ 150,539,263   $ 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)
Distributions 0    
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