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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, 2018     $ 174,062,164
Balance, Shares at Dec. 31, 2018     2,000,000
Purchases of Shares $ 0    
Purchases of Shares, Shares     3,800,000
Purchases of Shares     $ 331,936,195
Redemption of Shares 0    
Redemption of Shares, Shares     (3,300,000)
Redemption of Shares     $ (283,381,686)
Net Increase (Decrease) due to Share Transactions 0   $ 48,554,509
Net Increase (Decrease) due to Share Transactions, Shares     500,000
Net Comprehensive Income (Loss) (856,042) $ (856,042)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 856,042 856,042 $ (856,042)
Adjustment of Redeemable Capital Shares to Redemption Value 0   (1,719,348)
Balance at Sep. 30, 2019     $ 220,041,283
Balance, Shares at Sep. 30, 2019     2,500,000
Balance at Jun. 30, 2019     $ 216,584,710
Balance, Shares at Jun. 30, 2019     2,450,000
Purchases of Shares 0    
Purchases of Shares, Shares     350,000
Purchases of Shares     $ 30,973,922
Redemption of Shares 0    
Redemption of Shares, Shares     (300,000)
Redemption of Shares     $ (26,664,930)
Net Increase (Decrease) due to Share Transactions 0   $ 4,308,992
Net Increase (Decrease) due to Share Transactions, Shares     50,000
Net Comprehensive Income (Loss) (276,528) (276,528)  
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings 276,528 276,528 $ (276,528)
Adjustment of Redeemable Capital Shares to Redemption Value 0   (575,891)
Balance at Sep. 30, 2019     $ 220,041,283
Balance, Shares at Sep. 30, 2019     2,500,000
Balance at Dec. 31, 2019 $ 192,306,501   $ 192,306,501
Balance, Shares at Dec. 31, 2019 2,200,000   2,200,000
Purchases of Shares $ 0    
Purchases of Shares, Shares     2,450,000
Purchases of Shares     $ 214,849,410
Redemption of Shares 0    
Redemption of Shares, Shares     (1,950,000)
Redemption of Shares     $ (170,072,504)
Net Increase (Decrease) due to Share Transactions 0   $ 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 0   5,949,299
Balance at Sep. 30, 2020 $ 241,946,390   $ 241,946,390
Balance, Shares at Sep. 30, 2020 2,700,000   2,700,000
Balance at Jun. 30, 2020     $ 245,802,923
Balance, Shares at Jun. 30, 2020     2,800,000
Purchases of Shares $ 0    
Purchases of Shares, Shares     250,000
Purchases of Shares     $ 22,278,893
Redemption of Shares 0    
Redemption of Shares, Shares     (350,000)
Redemption of Shares     $ (31,161,636)
Net Increase (Decrease) due to Share Transactions 0   $ (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 0   5,409,475
Balance at Sep. 30, 2020 $ 241,946,390   $ 241,946,390
Balance, Shares at Sep. 30, 2020 2,700,000   2,700,000