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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, 2017     2,150,000
Temporary Equity, Balance at Dec. 31, 2017     $ 169,271,222
Purchases of Shares     $ 30,874,324
Purchases of Shares, Shares     400,000
Redemption of Shares     $ (27,013,806)
Redemption of Shares, Shares     (350,000)
Net Increase (Decrease) due to Share Transactions     $ 3,860,518
Net Increase (Decrease) due to Share Transactions, shares     50,000
Distributions $ (174,748) $ (174,748)  
Net Comprehensive Income (Loss) 239,298 239,298  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings (64,550) (64,550) $ 64,550
Adjustment of Redeemable Capital Shares to Redemption Value     $ (8,153,633)
Balance, Shares at Jun. 30, 2018     2,200,000
Temporary Equity, Balance at Jun. 30, 2018     $ 165,042,657
Balance, Shares at Mar. 31, 2018     2,200,000
Temporary Equity, Balance at Mar. 31, 2018     $ 168,363,908
Purchases of Shares     $ 15,276,053
Purchases of Shares, Shares     200,000
Redemption of Shares     $ (15,315,074)
Redemption of Shares, Shares     (200,000)
Net Increase (Decrease) due to Share Transactions     $ (39,021)
Distributions (114,058) (114,058)  
Net Comprehensive Income (Loss) 145,195 145,195  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings $ (31,137) (31,137) 31,137
Adjustment of Redeemable Capital Shares to Redemption Value     $ (3,313,367)
Balance, Shares at Jun. 30, 2018     2,200,000
Temporary Equity, Balance at Jun. 30, 2018     $ 165,042,657
Balance, Shares at Dec. 31, 2018 2,250,000   2,250,000
Temporary Equity, Balance at Dec. 31, 2018 $ 162,583,352   $ 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   1,750,000
Temporary Equity, Balance at Jun. 30, 2019 $ 132,186,489   $ 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   1,750,000
Temporary Equity, Balance at Jun. 30, 2019 $ 132,186,489   $ 132,186,489