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Debt - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 19, 2025
Aug. 17, 2022
Oct. 08, 2021
Dec. 23, 2020
Jun. 26, 2020
Apr. 24, 2019
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Jul. 25, 2024
Jun. 30, 2024
Debt Instrument [Line Items]                      
Debt instrument asset coverage percentage             286.40%   312.40%    
Aggregate principal amount             $ 182,000,000   $ 175,000,000    
Weighted average interest rate             4.781% 4.568%      
Net proceeds from the notes             $ 100,000,000        
Offering expenses             11,521,000   8,785,000    
Loss on extinguishment of debt             (251,000) $ (521,000)      
Secured borrowings             13,601,000   13,674,000    
Aggregate amount of outstanding of senior securities             363,601,000   308,674,000    
Fair value of loans included in investments             $ 13,601,000   13,505,000    
Credit facility, interest rate per annum             1.261% 0.851%      
SBA Debentures                      
Debt Instrument [Line Items]                      
Weighted average interest rate             4.323% 4.316%      
Offering expenses             $ 6,130,000   6,101,000    
Prepayment of debentures             $ 12,500,000 $ 35,000,000      
Debt instrument, maturity year range, start             2032 2026      
Debt instrument, maturity year range, end             2033 2027      
Loss on extinguishment of debt             $ (251,000) $ (521,000)      
Debt instrument term             10 years        
Interest rate payment term             semi-annually on March 1 and September 1        
Unused commitments amount             $ 155,500,000   $ 175,000,000    
Secured Borrowings                      
Debt Instrument [Line Items]                      
Weighted average interest rate             8.498% 9.363% 8.60%    
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.        
6.75% Notes Due 2030                      
Debt Instrument [Line Items]                      
Maturity date Mar. 19, 2030                    
Aggregate principal amount $ 100,000,000                    
Interest rate 6.75%                    
Net proceeds from the notes $ 96,950,000                    
Underwriting discounts $ 2,000,000                    
Percentage of public offering price 99.29954%                    
Offering expenses $ 350,000                    
Debt instrument, redemption description             The March 2030 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 September 19, 2029 (the date falling six months prior to maturity) and at par thereafter. Interest on the March 2030 Notes is payable on March 19 and September 19 of each year, beginning September 19, 2025. The Company does not intend to list the March 2030 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%