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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     $ 214,849,410
Purchases of Shares, Shares     2,450,000
Redemption of Shares     $ (170,072,504)
Redemption of Shares, Shares     (1,950,000)
Net Increase (Decrease) due to Share Transactions     $ 44,776,906
Net Increase (Decrease) due to Share Transactions, Shares     500,000
Net Comprehensive Income (Loss) $ (1,086,316) $ (1,086,316)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 1,086,316 1,086,316 $ (1,086,316)
Adjustment of Redeemable Capital Shares to Redemption Value     5,949,299
Balance at Sep. 30, 2020     $ 241,946,390
Balance, Shares at Sep. 30, 2020     2,700,000
Balance at Jun. 30, 2020     $ 245,802,923
Balance, Shares at Jun. 30, 2020     2,800,000
Purchases of Shares     $ 22,278,893
Purchases of Shares, Shares     250,000
Redemption of Shares     $ (31,161,636)
Redemption of Shares, Shares     (350,000)
Net Increase (Decrease) due to Share Transactions     $ (8,882,743)
Net Increase (Decrease) due to Share Transactions, Shares     (100,000)
Net Comprehensive Income (Loss) (383,265) (383,265)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 383,265 383,265 $ (383,265)
Adjustment of Redeemable Capital Shares to Redemption Value     5,409,475
Balance at Sep. 30, 2020     $ 241,946,390
Balance, Shares at Sep. 30, 2020     2,700,000
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     $ 47,226,990
Purchases of Shares, Shares     550,000
Redemption of Shares     $ (78,429,814)
Redemption of Shares, Shares     (900,000)
Net Increase (Decrease) due to Share Transactions     $ (31,202,824)
Net Increase (Decrease) due to Share Transactions, Shares     (350,000)
Net Comprehensive Income (Loss) $ (885,563) (885,563)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 885,563 885,563 $ (885,563)
Adjustment of Redeemable Capital Shares to Redemption Value     (16,862,030)
Balance at Sep. 30, 2021 $ 197,975,784   $ 197,975,784
Balance, Shares at Sep. 30, 2021 2,350,000   2,350,000
Balance at Jun. 30, 2021     $ 182,357,233
Balance, Shares at Jun. 30, 2021     2,150,000
Purchases of Shares     $ 17,105,401
Purchases of Shares, Shares     200,000
Net Increase (Decrease) due to Share Transactions     $ 17,105,401
Net Increase (Decrease) due to Share Transactions, Shares     200,000
Net Comprehensive Income (Loss) $ (298,603) (298,603)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 298,603 $ 298,603 $ (298,603)
Adjustment of Redeemable Capital Shares to Redemption Value     (1,188,247)
Balance at Sep. 30, 2021 $ 197,975,784   $ 197,975,784
Balance, Shares at Sep. 30, 2021 2,350,000   2,350,000