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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     $ (41,798,443)
Redemption of Shares, Shares     (550,000)
Net Increase (Decrease) due to Share Transactions     $ (30,232,438)
Net Increase (Decrease) due to Share Transactions, Shares     (400,000)
Net Comprehensive Income (Loss) $ (429,242) $ (429,242)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 429,242 429,242 $ (429,242)
Adjustment of Redeemable Capital Shares to Redemption Value     (8,552,157)
Balance at Sep. 30, 2021     $ 118,397,261
Balance, Shares at Sep. 30, 2021     1,650,000
Balance at Jun. 30, 2021     $ 134,374,488
Balance, Shares at Jun. 30, 2021     1,800,000
Redemption of Shares     $ (11,005,458)
Redemption of Shares, Shares     (150,000)
Net Increase (Decrease) due to Share Transactions     $ (11,005,458)
Net Increase (Decrease) due to Share Transactions, Shares     (150,000)
Net Comprehensive Income (Loss) (124,292) (124,292)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 124,292 124,292 $ (124,292)
Adjustment of Redeemable Capital Shares to Redemption Value     (4,847,477)
Balance at Sep. 30, 2021     $ 118,397,261
Balance, Shares at Sep. 30, 2021     1,650,000
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     $ 14,455,898
Purchases of Shares, Shares     200,000
Redemption of Shares     $ (17,369,236)
Redemption of Shares, Shares     (250,000)
Net Increase (Decrease) due to Share Transactions     $ (2,913,338)
Net Increase (Decrease) due to Share Transactions, Shares     (50,000)
Net Comprehensive Income (Loss) $ (250,882) (250,882)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 250,882 250,882 $ (250,882)
Adjustment of Redeemable Capital Shares to Redemption Value     (11,506,210)
Balance at Sep. 30, 2022 $ 82,731,926   $ 82,731,926
Balance, Shares at Sep. 30, 2022 1,300,000   1,300,000
Balance at Jun. 30, 2022     $ 95,346,441
Balance, Shares at Jun. 30, 2022     1,400,000
Purchases of Shares     $ 3,401,987
Purchases of Shares, Shares     50,000
Redemption of Shares     $ (10,265,136)
Redemption of Shares, Shares     (150,000)
Net Increase (Decrease) due to Share Transactions     $ (6,863,149)
Net Increase (Decrease) due to Share Transactions, Shares     (100,000)
Net Comprehensive Income (Loss) $ (55,816) (55,816)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 55,816 $ 55,816 $ (55,816)
Adjustment of Redeemable Capital Shares to Redemption Value     (5,695,550)
Balance at Sep. 30, 2022 $ 82,731,926   $ 82,731,926
Balance, Shares at Sep. 30, 2022 1,300,000   1,300,000