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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     $ 36,961,166
Purchases of Shares, Shares     500,000
Redemption of Shares     $ (74,136,784)
Redemption of Shares, Shares     (1,000,000)
Net Increase (Decrease) due to Share Transactions     $ (37,175,618)
Net Increase (Decrease) due to Share Transactions, Shares     (500,000)
Distributions $ (503,643) $ (503,643)  
Net Comprehensive Income (Loss) 524,338 524,338  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings (20,695) (20,695) $ 20,695
Adjustment of Redeemable Capital Shares to Redemption Value     $ 6,758,060
Balance, Shares at Jun. 30, 2019     1,750,000
Temporary Equity, Balance at Jun. 30, 2019     $ 132,186,489
Balance, Shares at Mar. 31, 2019     1,750,000
Temporary Equity, Balance at Mar. 31, 2019     $ 129,300,360
Purchases of Shares     $ 18,459,923
Purchases of Shares, Shares     250,000
Redemption of Shares     $ (18,387,663)
Redemption of Shares, Shares     (250,000)
Net Increase (Decrease) due to Share Transactions     $ 72,260
Distributions (246,634) (246,634)  
Net Comprehensive Income (Loss) 244,462 244,462  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 2,172 2,172 (2,172)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 2,816,041
Balance, Shares at Jun. 30, 2019     1,750,000
Temporary Equity, Balance at Jun. 30, 2019     $ 132,186,489
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     $ 32,129,693
Purchases of Shares, Shares     450,000
Redemption of Shares     $ (32,465,014)
Redemption of Shares, Shares     (450,000)
Net Increase (Decrease) due to Share Transactions     $ (335,321)
Distributions (235,745) (235,745)  
Net Comprehensive Income (Loss) 73,421 73,421  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 162,324 162,324 (162,324)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (5,313,108)
Balance, Shares at Jun. 30, 2020 1,550,000   1,550,000
Temporary Equity, Balance at Jun. 30, 2020 $ 112,153,039   $ 112,153,039
Balance, Shares at Mar. 31, 2020     1,650,000
Temporary Equity, Balance at Mar. 31, 2020     $ 114,356,721
Purchases of Shares     $ 14,324,353
Purchases of Shares, Shares     200,000
Redemption of Shares     $ (21,519,743)
Redemption of Shares, Shares     (300,000)
Net Increase (Decrease) due to Share Transactions     $ (7,195,390)
Net Increase (Decrease) due to Share Transactions, Shares     (100,000)
Net Comprehensive Income (Loss) (109,564) (109,564)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 109,564 $ 109,564 $ (109,564)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 5,101,272
Balance, Shares at Jun. 30, 2020 1,550,000   1,550,000
Temporary Equity, Balance at Jun. 30, 2020 $ 112,153,039   $ 112,153,039