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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, 2019     1,550,000
Balance at Dec. 31, 2019     $ 117,963,792
Purchases of Shares     $ 54,351,901
Purchases of Shares, Shares     750,000
Redemption of Shares     $ (32,465,014)
Redemption of Shares, Shares     (450,000)
Net Increase (Decrease) due to Share Transactions     $ 21,886,887
Net Increase (Decrease) due to Share Transactions, shares     300,000
Distributions $ (235,745) $ (235,745)  
Net Comprehensive Income (Loss) (54,661) (54,661)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 290,406 290,406 $ (290,406)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (3,206,213)
Balance, Shares at Sep. 30, 2020     1,850,000
Balance at Sep. 30, 2020     $ 136,354,060
Balance, Shares at Jun. 30, 2020     1,550,000
Balance at Jun. 30, 2020     $ 112,153,039
Purchases of Shares     $ 22,222,208
Purchases of Shares, Shares     300,000
Net Increase (Decrease) due to Share Transactions     $ 22,222,208
Net Increase (Decrease) due to Share Transactions, shares     300,000
Net Comprehensive Income (Loss) (128,082) (128,082)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 128,082 128,082 $ (128,082)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 2,106,895
Balance, Shares at Sep. 30, 2020     1,850,000
Balance at Sep. 30, 2020     $ 136,354,060
Balance, Shares at Dec. 31, 2020 1,950,000   1,950,000
Balance at Dec. 31, 2020 $ 150,539,263   $ 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)
Distributions 0    
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   1,850,000
Balance at Sep. 30, 2021 $ 143,196,799   $ 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   1,850,000
Balance at Sep. 30, 2021 $ 143,196,799   $ 143,196,799