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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, 2019     $ 91,378,070
Balance, Shares at Dec. 31, 2019     1,300,000
Purchases of Shares     $ 78,112,056
Purchases of Shares, Shares     1,100,000
Redemption of Shares     $ (16,387,195)
Redemption of Shares, Shares     (250,000)
Net Increase (Decrease) due to Share Transactions     $ 61,724,861
Net Increase (Decrease) due to Share Transactions, Shares     850,000
Distributions $ (25,880) $ (25,880)  
Net Comprehensive Income (Loss) (239,938) (239,938)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 265,818 265,818 $ (265,818)
Adjustment of Redeemable Capital Shares to Redemption Value     856,725
Balance at Sep. 30, 2020     $ 153,693,838
Balance, Shares at Sep. 30, 2020     2,150,000
Balance at Jun. 30, 2020     $ 89,356,715
Balance, Shares at Jun. 30, 2020     1,300,000
Purchases of Shares     $ 67,714,461
Purchases of Shares, Shares     950,000
Redemption of Shares     $ (7,143,463)
Redemption of Shares, Shares     (100,000)
Net Increase (Decrease) due to Share Transactions     $ 60,570,998
Net Increase (Decrease) due to Share Transactions, Shares     850,000
Net Comprehensive Income (Loss) (137,269) (137,269)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 137,269 137,269 $ (137,269)
Adjustment of Redeemable Capital Shares to Redemption Value     3,903,394
Balance at Sep. 30, 2020     $ 153,693,838
Balance, Shares at Sep. 30, 2020     2,150,000
Balance at Dec. 31, 2020 $ 157,611,098   $ 157,611,098
Balance, Shares at Dec. 31, 2020 2,050,000   2,050,000
Purchases of Shares     $ 11,566,005
Purchases of Shares, Shares     150,000
Redemption of Shares     $ (41,798,443)
Redemption of Shares, Shares     (550,000)
Net Increase (Decrease) due to Share Transactions     $ (30,232,438)
Net Increase (Decrease) due to Share Transactions, Shares     (400,000)
Net Comprehensive Income (Loss) $ (429,242) (429,242)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 429,242 429,242 $ (429,242)
Adjustment of Redeemable Capital Shares to Redemption Value     (8,552,157)
Balance at Sep. 30, 2021 $ 118,397,261   $ 118,397,261
Balance, Shares at Sep. 30, 2021 1,650,000   1,650,000
Balance at Jun. 30, 2021     $ 134,374,488
Balance, Shares at Jun. 30, 2021     1,800,000
Redemption of Shares     $ (11,005,458)
Redemption of Shares, Shares     (150,000)
Net Increase (Decrease) due to Share Transactions     $ (11,005,458)
Net Increase (Decrease) due to Share Transactions, Shares     (150,000)
Net Comprehensive Income (Loss) $ (124,292) (124,292)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 124,292 $ 124,292 $ (124,292)
Adjustment of Redeemable Capital Shares to Redemption Value     (4,847,477)
Balance at Sep. 30, 2021 $ 118,397,261   $ 118,397,261
Balance, Shares at Sep. 30, 2021 1,650,000   1,650,000