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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 at Dec. 31, 2018     $ 116,248,970
Balance, Shares at Dec. 31, 2018     1,650,000
Purchases of Shares     $ 7,094,912
Purchases of Shares, Shares     100,000
Redemption of Shares     $ (17,792,563)
Redemption of Shares, Shares     (250,000)
Net Increase (Decrease) due to Share Transactions     $ (10,697,651)
Net Increase (Decrease) due to Share Transactions, Shares     (150,000)
Distributions $ (268,645) $ (268,645)  
Net Comprehensive Income (Loss) 254,292 254,292  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 14,353 14,353 $ (14,353)
Adjustment of Redeemable Capital Shares to Redemption Value     1,089,807
Balance at Mar. 31, 2019     $ 106,626,773
Balance, Shares at Mar. 31, 2019     1,500,000
Balance at Dec. 31, 2019 $ 91,378,070   $ 91,378,070
Balance, Shares at Dec. 31, 2019 1,300,000   1,300,000
Distributions $ (25,880) (25,880)  
Net Comprehensive Income (Loss) (14,999) (14,999)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 40,879 $ 40,879 $ (40,879)
Adjustment of Redeemable Capital Shares to Redemption Value     (11,812,959)
Balance at Mar. 31, 2020 $ 79,524,232   $ 79,524,232
Balance, Shares at Mar. 31, 2020 1,300,000   1,300,000