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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, Shares at Dec. 31, 2020     1,950,000
Balance at Dec. 31, 2020     $ 150,539,263
Purchases of Shares     $ 134,071,472
Purchases of Shares, Shares     1,700,000
Redemption of Shares     $ (140,797,232)
Redemption of Shares, Shares     (1,800,000)
Net Increase (Decrease) due to Share Transactions     $ (6,725,760)
Net Increase (Decrease) due to Share Transactions, shares     (100,000)
Net Comprehensive Income (Loss) $ (537,936) $ (537,936)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 537,936 537,936 $ (537,936)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (78,768)
Balance, Shares at Sep. 30, 2021     1,850,000
Balance at Sep. 30, 2021     $ 143,196,799
Balance, Shares at Jun. 30, 2021     2,650,000
Balance at Jun. 30, 2021     $ 210,060,871
Purchases of Shares     $ 3,939,508
Purchases of Shares, Shares     50,000
Redemption of Shares     $ (65,780,896)
Redemption of Shares, Shares     (850,000)
Net Increase (Decrease) due to Share Transactions     $ (61,841,388)
Net Increase (Decrease) due to Share Transactions, shares     (800,000)
Net Comprehensive Income (Loss) (189,939) (189,939)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 189,939 189,939 $ (189,939)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (4,832,745)
Balance, Shares at Sep. 30, 2021     1,850,000
Balance at Sep. 30, 2021     $ 143,196,799
Balance, Shares at Dec. 31, 2021 1,800,000   1,800,000
Balance at Dec. 31, 2021 $ 139,593,928   $ 139,593,928
Purchases of Shares     $ 37,724,362
Purchases of Shares, Shares     500,000
Redemption of Shares     $ (65,157,665)
Redemption of Shares, Shares     (850,000)
Net Increase (Decrease) due to Share Transactions     $ (27,433,303)
Net Increase (Decrease) due to Share Transactions, shares     (350,000)
Distributions (55,652) (55,652)  
Net Comprehensive Income (Loss) (183,243) (183,243)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 238,895 238,895 $ (238,895)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (8,734,755)
Balance, Shares at Sep. 30, 2022 1,450,000   1,450,000
Balance at Sep. 30, 2022 $ 103,186,975   $ 103,186,975
Balance, Shares at Jun. 30, 2022     1,300,000
Balance at Jun. 30, 2022     $ 98,527,561
Purchases of Shares     $ 18,573,216
Purchases of Shares, Shares     250,000
Redemption of Shares     $ (7,430,312)
Redemption of Shares, Shares     (100,000)
Net Increase (Decrease) due to Share Transactions     $ 11,142,904
Net Increase (Decrease) due to Share Transactions, shares     150,000
Distributions (55,652) (55,652)  
Net Comprehensive Income (Loss) 76,559 76,559  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ (20,907) $ (20,907) $ 20,907
Adjustment of Redeemable Capital Shares to Redemption Value     $ (6,504,397)
Balance, Shares at Sep. 30, 2022 1,450,000   1,450,000
Balance at Sep. 30, 2022 $ 103,186,975   $ 103,186,975