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Statements of Changes in Shareholders' Equity and Redeemable Capital Shares - USD ($)
Total
Retained Earnings
Redeemable Capital Shares
Balance at Dec. 31, 2019     $ 192,306,501
Balance, Shares at Dec. 31, 2019     2,200,000
Purchases of Shares     $ 192,570,516
Purchases of Shares, Shares     2,200,000
Redemption of Shares     $ (138,910,868)
Redemption of Shares, Shares     (1,600,000)
Net Increase (Decrease) due to Share Transactions     $ 53,659,648
Net Increase (Decrease) due to Share Transactions, Shares     600,000
Net Comprehensive Income (Loss) $ (703,051) $ (703,051)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 703,051 703,051 $ (703,051)
Adjustment of Redeemable Capital Shares to Redemption Value     539,825
Balance at Jun. 30, 2020     $ 245,802,923
Balance, Shares at Jun. 30, 2020     2,800,000
Balance at Mar. 31, 2020     $ 232,836,075
Balance, Shares at Mar. 31, 2020     2,650,000
Purchases of Shares     $ 87,256,470
Purchases of Shares, Shares     1,000,000
Redemption of Shares     $ (75,012,206)
Redemption of Shares, Shares     (850,000)
Net Increase (Decrease) due to Share Transactions     $ 12,244,264
Net Increase (Decrease) due to Share Transactions, Shares     150,000
Net Comprehensive Income (Loss) (391,347) (391,347)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 391,347 391,347 $ (391,347)
Adjustment of Redeemable Capital Shares to Redemption Value     1,113,931
Balance at Jun. 30, 2020     $ 245,802,923
Balance, Shares at Jun. 30, 2020     2,800,000
Balance at Dec. 31, 2020 $ 246,926,201   $ 246,926,201
Balance, Shares at Dec. 31, 2020 2,700,000   2,700,000
Purchases of Shares     $ 30,121,590
Purchases of Shares, Shares     350,000
Redemption of Shares     $ (78,429,814)
Redemption of Shares, Shares     (900,000)
Net Increase (Decrease) due to Share Transactions     $ (48,308,224)
Net Increase (Decrease) due to Share Transactions, Shares     (550,000)
Net Comprehensive Income (Loss) $ (586,838) (586,838)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 586,838 586,838 $ (586,838)
Adjustment of Redeemable Capital Shares to Redemption Value     (15,673,906)
Balance at Jun. 30, 2021 $ 182,357,233   $ 182,357,233
Balance, Shares at Jun. 30, 2021 2,150,000   2,150,000
Balance at Mar. 31, 2021     $ 187,708,098
Balance, Shares at Mar. 31, 2021     2,200,000
Purchases of Shares     $ 25,580,220
Purchases of Shares, Shares     300,000
Redemption of Shares     $ (30,187,035)
Redemption of Shares, Shares     (350,000)
Net Increase (Decrease) due to Share Transactions     $ (4,606,815)
Net Increase (Decrease) due to Share Transactions, Shares     (50,000)
Net Comprehensive Income (Loss) $ (249,150) (249,150)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 249,150 $ 249,150 $ (249,150)
Adjustment of Redeemable Capital Shares to Redemption Value     (494,900)
Balance at Jun. 30, 2021 $ 182,357,233   $ 182,357,233
Balance, Shares at Jun. 30, 2021 2,150,000   2,150,000