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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, 2020     $ 157,611,098
Balance, Shares at Dec. 31, 2020     2,050,000
Purchases of Shares     $ 11,566,005
Purchases of Shares, Shares     150,000
Redemption of Shares     $ (30,792,985)
Redemption of Shares, Shares     (400,000)
Net Increase (Decrease) due to Share Transactions     $ (19,226,980)
Net Increase (Decrease) due to Share Transactions, Shares     (250,000)
Net Comprehensive Income (Loss) $ (304,950) $ (304,950)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 304,950 304,950 $ (304,950)
Adjustment of Redeemable Capital Shares to Redemption Value     (3,704,680)
Balance at Jun. 30, 2021     $ 134,374,488
Balance, Shares at Jun. 30, 2021     1,800,000
Balance at Mar. 31, 2021     $ 159,205,417
Balance, Shares at Mar. 31, 2021     2,100,000
Redemption of Shares     $ (23,077,716)
Redemption of Shares, Shares     (300,000)
Net Increase (Decrease) due to Share Transactions     $ (23,077,716)
Net Increase (Decrease) due to Share Transactions, Shares     (300,000)
Net Comprehensive Income (Loss) (147,612) (147,612)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 147,612 147,612 $ (147,612)
Adjustment of Redeemable Capital Shares to Redemption Value     (1,605,601)
Balance at Jun. 30, 2021     $ 134,374,488
Balance, Shares at Jun. 30, 2021     1,800,000
Balance at Dec. 31, 2021 $ 97,402,356   $ 97,402,356
Balance, Shares at Dec. 31, 2021 1,350,000   1,350,000
Purchases of Shares     $ 11,053,911
Purchases of Shares, Shares     150,000
Redemption of Shares     $ (7,104,100)
Redemption of Shares, Shares     (100,000)
Net Increase (Decrease) due to Share Transactions     $ 3,949,811
Net Increase (Decrease) due to Share Transactions, Shares     50,000
Net Comprehensive Income (Loss) $ (195,066) (195,066)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 195,066 195,066 $ (195,066)
Adjustment of Redeemable Capital Shares to Redemption Value     (5,810,660)
Balance at Jun. 30, 2022 $ 95,346,441   $ 95,346,441
Balance, Shares at Jun. 30, 2022 1,400,000   1,400,000
Balance at Mar. 31, 2022     $ 100,504,694
Balance, Shares at Mar. 31, 2022     1,350,000
Purchases of Shares     $ 7,470,614
Purchases of Shares, Shares     100,000
Redemption of Shares     $ (3,575,752)
Redemption of Shares, Shares     (50,000)
Net Increase (Decrease) due to Share Transactions     $ 3,894,862
Net Increase (Decrease) due to Share Transactions, Shares     50,000
Net Comprehensive Income (Loss) $ (101,021) (101,021)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 101,021 $ 101,021 $ (101,021)
Adjustment of Redeemable Capital Shares to Redemption Value     (8,952,094)
Balance at Jun. 30, 2022 $ 95,346,441   $ 95,346,441
Balance, Shares at Jun. 30, 2022 1,400,000   1,400,000