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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, 2019     $ 91,378,070
Balance, Shares at Dec. 31, 2019     1,300,000
Distributions $ (25,880) $ (25,880)  
Net Comprehensive Income (Loss) (14,999) (14,999)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 40,879 40,879 $ (40,879)
Adjustment of Redeemable Capital Shares to Redemption Value     (11,812,959)
Balance at Mar. 31, 2020     $ 79,524,232
Balance, Shares at Mar. 31, 2020     1,300,000
Balance at Dec. 31, 2020 $ 157,611,098   $ 157,611,098
Balance, Shares at Dec. 31, 2020 2,050,000   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   $ 159,205,417
Balance, Shares at Mar. 31, 2021 2,100,000   2,100,000