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Debt - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 17, 2022
Oct. 08, 2021
Dec. 23, 2020
Jun. 26, 2020
Apr. 24, 2019
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Jul. 25, 2024
Jun. 30, 2024
Debt Instrument [Line Items]                          
Debt instrument asset coverage percentage                 316.70%   321.70%    
Aggregate principal amount           $ 175,000,000     $ 175,000,000   $ 210,000,000    
Weighted average interest rate           4.647%   4.265% 4.647% 4.265%      
Offering expenses           $ 7,594,000     $ 7,594,000   9,367,000    
Loss on extinguishment of debt             $ (521,000) $ (23,000) (521,000) $ (23,000)      
Secured borrowings           14,025,000     14,025,000   15,880,000    
Aggregate amount of outstanding of senior securities                 304,025,000   265,880,000    
Fair value of loans included in investments           $ 14,019,000     $ 14,019,000   15,800,000    
Credit facility, interest rate per annum                 0.696% 1.261%      
SBA Debentures                          
Debt Instrument [Line Items]                          
Weighted average interest rate           4.316%   4.016% 4.316% 4.016%      
Offering expenses           $ 4,528,000     $ 4,528,000   5,528,000    
Prepayment of debentures           0   $ 5,000,000 $ 35,000,000 $ 5,000,000      
Debt instrument, maturity year range, start                 2026 2025      
Debt instrument, maturity year range, end                 2027 2026      
Loss on extinguishment of debt                 $ (521,000) $ (23,000)      
Debt instrument term                 10 years        
Interest rate payment term                 semi-annually on March 1 and September 1        
Unused commitments amount           $ 0     $ 0   $ 0    
Secured Borrowings                          
Debt Instrument [Line Items]                          
Weighted average interest rate           8.915%   9.291% 8.915% 9.291% 9.40%    
4.75% Notes due 2026                          
Debt Instrument [Line Items]                          
Maturity date     Jan. 31, 2026                    
Aggregate principal amount     $ 125,000,000                    
Interest rate     4.75%                    
Net proceeds from the notes     $ 122,134,000                    
Underwriting discounts     $ 2,500,000                    
Percentage of public offering price     100.00%                    
Offering expenses     $ 366,000                    
Debt instrument, redemption description                 The January 2026 Notes may be redeemed in whole or in part at any time or from time to time at our option subject to a make whole provision if redeemed before October 31, 2025 (the date falling three months prior to maturity) and at par thereafter. Interest on the January 2026 Notes is payable on January 31 and July 31 of each year. The Company does not intend to list the January 2026 Notes on any securities exchange or automated dealer quotation system.        
3.50% Notes Due 2026                          
Debt Instrument [Line Items]                          
Maturity date   Nov. 15, 2026                      
Aggregate principal amount   $ 125,000,000                      
Interest rate   3.50%                      
Net proceeds from the notes   $ 122,177,000                      
Underwriting discounts   $ 2,500,000                      
Percentage of public offering price   99.996%                      
Offering expenses   $ 318,000                      
Debt instrument, redemption description                 The November 2026 Notes may be redeemed in whole or in part at any time or from time to time at our option subject to a make whole provision if redeemed before August 15, 2026 (the date falling three months prior to maturity) and at par thereafter. Interest on the November 2026 Notes is payable on May 15 and November 15 of each year. The Company does not intend to list the November 2026 Notes on any securities exchange or automated dealer quotation system.        
Revolving Credit Facility | Credit Agreement | ING Capital LLC                          
Debt Instrument [Line Items]                          
Maturity date Aug. 17, 2027     Apr. 24, 2023                  
Interest rate prior to certain conditions satisfied 3.00%     2.675%                  
Interest rate after certain conditions satisfied 2.675%     2.50%                  
Asset coverage ratio 1.50%     2.00%                  
Senior asset coverage ratio 2.00%                        
Remaining unused portion of Credit Facility commitment percentage         0.50%                
Performing first lien bank loans, minimum percentage         35.00%                
Credit Facility commitment                       $ 140,000,000 $ 100,000,000
Revolving Credit Facility | Credit Agreement | ING Capital LLC | Maximum                          
Debt Instrument [Line Items]                          
Credit facility, interest rate per annum         2.675%                
Credit facility commitment percentage         35.00%                
Revolving Credit Facility | Credit Agreement | ING Capital LLC | Minimum                          
Debt Instrument [Line Items]                          
Credit facility, interest rate per annum         2.50%