v3.25.1
Investments in Affiliates -Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investments in and Advances to Affiliates [Line Items]    
Dividend Income $ 3,003,895 $ 2,267,969
Affiliated Investments [Member] | Money Market Mutual Fund - Invesco Government & Agency Portfolio, Institutional Class [Member]    
Investments in and Advances to Affiliates [Line Items]    
Investment Owned, at Fair Value, Beginning Balance 279,113,690 111,534,057
Purchases at Cost 297,081,374 230,844,037
Proceeds from Sales (385,476,981) (208,212,022)
Investment Owned, at Fair Value, Ending Balance 190,718,083 134,166,072
Dividend Income $ 3,003,895 $ 2,267,969