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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     $ 51,850,144
Purchases of Shares, Shares     700,000
Redemption of Shares     $ (103,973,357)
Redemption of Shares, Shares     (1,400,000)
Net Increase (Decrease) due to Share Transactions     $ (52,123,213)
Net Increase (Decrease) due to Share Transactions, Shares     (700,000)
Distributions $ (753,725) $ (753,725)  
Net Comprehensive Income (Loss) 753,436 753,436  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 289 289 $ (289)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 5,079,863
Balance, Shares at Sep. 30, 2019     1,550,000
Temporary Equity, Balance at Sep. 30, 2019     $ 115,539,713
Balance, Shares at Jun. 30, 2019     1,750,000
Temporary Equity, Balance at Jun. 30, 2019     $ 132,186,489
Purchases of Shares     $ 14,888,978
Purchases of Shares, Shares     200,000
Redemption of Shares     $ (29,836,573)
Redemption of Shares, Shares     (400,000)
Net Increase (Decrease) due to Share Transactions     $ (14,947,595)
Net Increase (Decrease) due to Share Transactions, Shares     (200,000)
Distributions (250,082) (250,082)  
Net Comprehensive Income (Loss) 229,098 229,098  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 20,984 20,984 $ (20,984)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (1,678,197)
Balance, Shares at Sep. 30, 2019     1,550,000
Temporary Equity, Balance at Sep. 30, 2019     $ 115,539,713
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     $ 54,351,901
Purchases of Shares, Shares     750,000
Redemption of Shares     $ (32,465,014)
Redemption of Shares, Shares     (450,000)
Net Increase (Decrease) due to Share Transactions     $ 21,886,887
Net Increase (Decrease) due to Share Transactions, Shares     300,000
Distributions (235,745) (235,745)  
Net Comprehensive Income (Loss) (54,661) (54,661)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 290,406 290,406 $ (290,406)
Adjustment of Redeemable Capital Shares to Redemption Value     $ (3,206,213)
Balance, Shares at Sep. 30, 2020 1,850,000   1,850,000
Temporary Equity, Balance at Sep. 30, 2020 $ 136,354,060   $ 136,354,060
Balance, Shares at Jun. 30, 2020     1,550,000
Temporary Equity, Balance at Jun. 30, 2020     $ 112,153,039
Purchases of Shares     $ 22,222,208
Purchases of Shares, Shares     300,000
Net Increase (Decrease) due to Share Transactions     $ 22,222,208
Net Increase (Decrease) due to Share Transactions, Shares     300,000
Net Comprehensive Income (Loss) (128,082) (128,082)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ 128,082 $ 128,082 $ (128,082)
Adjustment of Redeemable Capital Shares to Redemption Value     $ 2,106,895
Balance, Shares at Sep. 30, 2020 1,850,000   1,850,000
Temporary Equity, Balance at Sep. 30, 2020 $ 136,354,060   $ 136,354,060