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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, 2023     $ 219,560,639
Balance, Shares at Dec. 31, 2023     2,150,000
Purchases of Shares     $ 75,353,138
Purchases of Shares, Shares     750,000
Redemption of Shares     $ (104,814,993)
Redemption of Shares, Shares     (1,050,000)
Net Increase (Decrease) due to Share Transactions     $ (29,461,855)
Net Increase (Decrease) due to Share Transactions, shares     (300,000)
Distributions $ (3,276,798) $ (3,276,798)  
Net Comprehensive Income (Loss) 3,230,945 3,230,945  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 45,853 45,853 $ (45,853)
Adjustment of Redeemable Capital Shares to Redemption Value     761,931
Balance at Sep. 30, 2024     $ 190,814,862
Balance, Shares at Sep. 30, 2024     1,850,000
Balance at Jun. 30, 2024     $ 173,361,517
Balance, Shares at Jun. 30, 2024     1,750,000
Purchases of Shares     $ 25,448,454
Purchases of Shares, Shares     250,000
Redemption of Shares     $ (15,119,687)
Redemption of Shares, Shares     (150,000)
Net Increase (Decrease) due to Share Transactions     $ 10,328,767
Net Increase (Decrease) due to Share Transactions, shares     100,000
Distributions (946,519) (946,519)  
Net Comprehensive Income (Loss) 940,117 940,117  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 6,402 6,402 $ (6,402)
Adjustment of Redeemable Capital Shares to Redemption Value     7,130,980
Balance at Sep. 30, 2024     $ 190,814,862
Balance, Shares at Sep. 30, 2024     1,850,000
Balance at Dec. 31, 2024 $ 167,424,356   $ 167,424,356
Balance, Shares at Dec. 31, 2024 1,750,000   1,750,000
Purchases of Shares     $ 494,656,678
Purchases of Shares, Shares     4,750,000
Redemption of Shares     $ (194,197,969)
Redemption of Shares, Shares     (1,850,000)
Net Increase (Decrease) due to Share Transactions     $ 300,458,709
Net Increase (Decrease) due to Share Transactions, shares     2,900,000
Distributions $ (2,715,590) (2,715,590)  
Net Comprehensive Income (Loss) 2,631,144 2,631,144  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 84,446 84,446 $ (84,446)
Adjustment of Redeemable Capital Shares to Redemption Value     36,603,567
Balance at Sep. 30, 2025 $ 504,402,186   $ 504,402,186
Balance, Shares at Sep. 30, 2025 4,650,000   4,650,000
Balance at Jun. 30, 2025     $ 579,792,370
Balance, Shares at Jun. 30, 2025     5,350,000
Purchases of Shares     $ 48,659,147
Purchases of Shares, Shares     450,000
Redemption of Shares     $ (123,973,881)
Redemption of Shares, Shares     (1,150,000)
Net Increase (Decrease) due to Share Transactions     $ (75,314,734)
Net Increase (Decrease) due to Share Transactions, shares     (700,000)
Distributions $ (1,017,990) (1,017,990)  
Net Comprehensive Income (Loss) 975,734 975,734  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 42,256 $ 42,256 $ (42,256)
Adjustment of Redeemable Capital Shares to Redemption Value     (33,194)
Balance at Sep. 30, 2025 $ 504,402,186   $ 504,402,186
Balance, Shares at Sep. 30, 2025 4,650,000   4,650,000