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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
Purchases of Shares     $ 10,397,595
Purchases of Shares, Shares     150,000
Redemption of Shares     $ (9,243,732)
Redemption of Shares, Shares     (150,000)
Net Increase (Decrease) due to Share Transactions     $ 1,153,863
Distributions $ (25,880) $ (25,880)  
Net Comprehensive Income (Loss) (102,669) (102,669)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 128,549 128,549 (128,549)
Adjustment of Redeemable Capital Shares to Redemption Value     (3,046,669)
Balance at Jun. 30, 2020     $ 89,356,715
Balance, Shares at Jun. 30, 2020     1,300,000
Balance at Mar. 31, 2020     $ 79,524,232
Balance, Shares at Mar. 31, 2020     1,300,000
Purchases of Shares     $ 10,397,595
Purchases of Shares, Shares     150,000
Redemption of Shares     $ (9,243,732)
Redemption of Shares, Shares     (150,000)
Net Increase (Decrease) due to Share Transactions     $ 1,153,863
Net Comprehensive Income (Loss) (87,670) (87,670)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 87,670 87,670 (87,670)
Adjustment of Redeemable Capital Shares to Redemption Value     8,766,290
Balance at Jun. 30, 2020     $ 89,356,715
Balance, Shares at Jun. 30, 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     $ (30,792,985)
Redemption of Shares, Shares     (400,000)
Net Increase (Decrease) due to Share Transactions     $ (19,226,980)
Net Increase (Decrease) due to Share Transactions, Shares     (250,000)
Net Comprehensive Income (Loss) $ (304,950) (304,950)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 304,950 304,950 $ (304,950)
Adjustment of Redeemable Capital Shares to Redemption Value     (3,704,680)
Balance at Jun. 30, 2021 $ 134,374,488   $ 134,374,488
Balance, Shares at Jun. 30, 2021 1,800,000   1,800,000
Balance at Mar. 31, 2021     $ 159,205,417
Balance, Shares at Mar. 31, 2021     2,100,000
Redemption of Shares     $ (23,077,716)
Redemption of Shares, Shares     (300,000)
Net Increase (Decrease) due to Share Transactions     $ (23,077,716)
Net Increase (Decrease) due to Share Transactions, Shares     (300,000)
Net Comprehensive Income (Loss) $ (147,612) (147,612)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 147,612 $ 147,612 $ (147,612)
Adjustment of Redeemable Capital Shares to Redemption Value     (1,605,601)
Balance at Jun. 30, 2021 $ 134,374,488   $ 134,374,488
Balance, Shares at Jun. 30, 2021 1,800,000   1,800,000