v3.26.1
Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Investments in and Advances to Affiliates, Activity [Line Items]        
Investment Owned, at Fair Value, Beginning Balance     $ 34,215,550  
Change in Unrealized Appreciation (Depreciation) $ 0 $ (0) $ (21,417)
Investment Owned, at Fair Value, Ending Balance 71,506,010   71,506,010  
Dividend Income 781,720 436,492 1,111,725 818,779
Affiliated Investments [Member] | Money Market Mutual Fund - Invesco Government & Agency Portfolio, Institutional Class [Member]        
Investments in and Advances to Affiliates, Activity [Line Items]        
Investment Owned, at Fair Value, Beginning Balance 78,053,015 45,395,218 34,215,550 26,514,962
Purchases at Cost 75,936,954 6,886,906 120,721,621 43,818,023
Proceeds from Sales (82,483,959) (9,558,497) (83,431,161) (27,609,358)
Investment Owned, at Fair Value, Ending Balance 71,506,010 42,723,627 71,506,010 42,723,627
Dividend Income $ 781,720 $ 436,492 $ 1,111,725 $ 818,779