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Statements of Changes in Shareholders' Equity and Redeemable Capital Shares - USD ($)
Total
Retained Earnings [Member]
Redeemable Capital Shares [Member]
Balance, Shares at Dec. 31, 2018     2,250,000
Temporary Equity, Balance at Dec. 31, 2018     $ 162,583,352
Purchases of Shares     $ 63,130,986
Purchases of Shares, Shares     850,000
Redemption of Shares     $ (115,233,504)
Redemption of Shares, Shares     (1,550,000)
Net Increase (Decrease) due to Share Transactions     $ (52,102,518)
Net Increase (Decrease) due to Share Transactions, shares     (700,000)
Distributions $ (975,509) $ (975,509)  
Net Comprehensive Income (Loss) 972,026 972,026  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 3,483 3,483 $ (3,483)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 7,486,441
Balance, Shares at Dec. 31, 2019 1,550,000   1,550,000
Temporary Equity, Balance at Dec. 31, 2019 $ 117,963,792   $ 117,963,792
Purchases of Shares     $ 73,499,173
Purchases of Shares, Shares     1,000,000
Redemption of Shares     $ (43,761,943)
Redemption of Shares, Shares     (600,000)
Net Increase (Decrease) due to Share Transactions     $ 29,737,230
Net Increase (Decrease) due to Share Transactions, shares     400,000
Distributions (235,745) (235,745)  
Net Comprehensive Income (Loss) (195,074) (195,074)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 430,819 $ 430,819 $ (430,819)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 3,269,060
Balance, Shares at Dec. 31, 2020 1,550,000   1,950,000
Temporary Equity, Balance at Dec. 31, 2020 $ 150,539,263   $ 150,539,263