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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, 2018     2,250,000
Temporary Equity, Balance at Dec. 31, 2018     $ 162,583,352
Purchases of Shares     $ 18,501,243
Purchases of Shares, Shares     250,000
Redemption of Shares     $ (55,749,121)
Redemption of Shares, Shares     (750,000)
Net Increase (Decrease) due to Share Transactions     $ (37,247,878)
Net Increase (Decrease) due to Share Transactions, Shares     (500,000)
Distributions $ (257,009) $ (257,009)  
Net Comprehensive Income (Loss) 279,876 279,876  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ (22,867) (22,867) $ 22,867
Adjustment of Redeemable Capital Shares to Redemption Value     $ 3,942,019
Balance, Shares at Mar. 31, 2019     1,750,000
Temporary Equity, Balance at Mar. 31, 2019     $ 129,300,360
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     $ 17,805,340
Purchases of Shares, Shares     250,000
Redemption of Shares     $ (10,945,271)
Redemption of Shares, Shares     (150,000)
Net Increase (Decrease) due to Share Transactions     $ 6,860,069
Net Increase (Decrease) due to Share Transactions, Shares     100,000
Distributions (235,745) (235,745)  
Net Comprehensive Income (Loss) 182,985 182,985  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 52,760 $ 52,760 $ (52,760)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (10,414,380)
Balance, Shares at Mar. 31, 2020 1,650,000   1,650,000
Temporary Equity, Balance at Mar. 31, 2020 $ 114,356,721   $ 114,356,721