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Statements of Changes in Shareholders' Equity and Redeemable Capital Shares (unaudited) - USD ($)
Total
Retained Earnings [Member]
Redeemable Capital Shares [Member]
Balance at Dec. 31, 2021     $ 211,443,880
Balance, Shares at Dec. 31, 2021     2,000,000
Purchases of Shares     $ 255,820,786
Purchases of Shares, Shares     2,550,000
Redemption of Shares     $ (231,642,986)
Redemption of Shares, Shares     (2,300,000)
Net Increase (Decrease) due to Share Transactions     $ 24,177,800
Net Increase (Decrease) due to Share Transactions, Shares     250,000
Net Comprehensive Income (Loss) $ (1,123,899) $ (1,123,899)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,123,899 1,123,899 $ (1,123,899)
Adjustment of Redeemable Capital Shares to Redemption Value     (16,964,621)
Balance at Jun. 30, 2022     $ 217,533,160
Balance, Shares at Jun. 30, 2022     2,250,000
Balance at Mar. 31, 2022     $ 185,702,172
Balance, Shares at Mar. 31, 2022     1,800,000
Purchases of Shares     $ 166,662,394
Purchases of Shares, Shares     1,700,000
Redemption of Shares     $ (123,009,913)
Redemption of Shares, Shares     (1,250,000)
Net Increase (Decrease) due to Share Transactions     $ 43,652,481
Net Increase (Decrease) due to Share Transactions, Shares     450,000
Net Comprehensive Income (Loss) (596,358) (596,358)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 596,358 596,358 $ (596,358)
Adjustment of Redeemable Capital Shares to Redemption Value     (11,225,135)
Balance at Jun. 30, 2022     $ 217,533,160
Balance, Shares at Jun. 30, 2022     2,250,000
Balance at Dec. 31, 2022 $ 285,606,461   $ 285,606,461
Balance, Shares at Dec. 31, 2022 2,900,000   2,900,000
Purchases of Shares     $ 75,017,103
Purchases of Shares, Shares     750,000
Redemption of Shares     $ (115,014,404)
Redemption of Shares, Shares     (1,150,000)
Net Increase (Decrease) due to Share Transactions     $ (39,997,301)
Net Increase (Decrease) due to Share Transactions, Shares     (400,000)
Distributions $ (1,370,672) (1,370,672)  
Net Comprehensive Income (Loss) 1,733,100 1,733,100  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings (362,428) (362,428) $ 362,428
Adjustment of Redeemable Capital Shares to Redemption Value     6,026,844
Balance at Jun. 30, 2023 $ 251,998,432   $ 251,998,432
Balance, Shares at Jun. 30, 2023 2,500,000   2,500,000
Balance at Mar. 31, 2023     $ 265,893,230
Balance, Shares at Mar. 31, 2023     2,650,000
Purchases of Shares     $ 40,561,022
Purchases of Shares, Shares     400,000
Redemption of Shares     $ (55,309,911)
Redemption of Shares, Shares     (550,000)
Net Increase (Decrease) due to Share Transactions     $ (14,748,889)
Net Increase (Decrease) due to Share Transactions, Shares     (150,000)
Distributions $ (974,205) (974,205)  
Net Comprehensive Income (Loss) 1,107,354 1,107,354  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings (133,149) $ (133,149) $ 133,149
Adjustment of Redeemable Capital Shares to Redemption Value     720,942
Balance at Jun. 30, 2023 $ 251,998,432   $ 251,998,432
Balance, Shares at Jun. 30, 2023 2,500,000   2,500,000