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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     $ (7,715,269)
Redemption of Shares, Shares     (100,000)
Net Increase (Decrease) due to Share Transactions     $ 3,850,736
Net Increase (Decrease) due to Share Transactions, Shares     50,000
Net Comprehensive Income (Loss) $ (157,338) $ (157,338)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 157,338 157,338 $ (157,338)
Adjustment of Redeemable Capital Shares to Redemption Value     (2,099,079)
Balance at Mar. 31, 2021     $ 159,205,417
Balance, Shares at Mar. 31, 2021     2,100,000
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     $ 3,583,297
Purchases of Shares, Shares     50,000
Redemption of Shares     $ (3,528,348)
Redemption of Shares, Shares     (50,000)
Net Increase (Decrease) due to Share Transactions     $ 54,949
Net Comprehensive Income (Loss) $ (94,045) (94,045)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 94,045 $ 94,045 (94,045)
Adjustment of Redeemable Capital Shares to Redemption Value     3,141,434
Balance at Mar. 31, 2022 $ 100,504,694   $ 100,504,694
Balance, Shares at Mar. 31, 2022 1,350,000   1,350,000