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Subsequent Events - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 27, 2025
Jan. 24, 2025
Jan. 18, 2025
Jan. 14, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Feb. 13, 2025
Feb. 06, 2025
Feb. 05, 2025
Jan. 07, 2025
Jan. 06, 2025
Subsequent Event [Line Items]                          
Investments at cost         $ 1,075,157 [1],[2],[3] $ 936,629 [4],[5],[6]              
Investment, Type [Extensible Enumeration]         Pfanstiehl Inc [Member] Pfanstiehl Inc [Member]              
Total net realized gain (loss) on investments         $ 11,585 $ 24,071 $ 65,635 $ 65,635          
Repayment of SBA debentures         $ 35,000 $ 5,000   $ 30,000          
Weighted average interest rate         4.599% 4.346% 4.037%            
SBA Debentures                          
Subsequent Event [Line Items]                          
Weighted average interest rate         4.316% 4.226% 3.479%            
SBA Debentures | Subsequent Events                          
Subsequent Event [Line Items]                          
Repayment of SBA debentures $ 12,500                        
Weighted average interest rate 5.755%                        
SBA Debentures | Subsequent Events | Minimum                          
Subsequent Event [Line Items]                          
Maturity date 2032-03                        
SBA Debentures | Subsequent Events | Maximum                          
Subsequent Event [Line Items]                          
Maturity date 2033-09                        
5.207% Fixed Interest Rate | SBA Debentures | Subsequent Events                          
Subsequent Event [Line Items]                          
Debt instrument issued amount                   $ 5,000      
Debt instrument interim interest rate                   5.207%      
5.217% Fixed Interest Rate | SBA Debentures | Subsequent Events                          
Subsequent Event [Line Items]                          
Debt instrument issued amount                 $ 14,500        
Debt instrument interim interest rate                 5.217%        
First Lien Debt                          
Subsequent Event [Line Items]                          
Investments at cost [7]         $ 729,084 $ 577,684              
First Lien Debt | Subsequent Events                          
Subsequent Event [Line Items]                          
Investment, Type [Extensible Enumeration]                     Fraser Steel LLC Onsight Industries, LLC Customer Expressions Corp
Common Equity | Subsequent Events                          
Subsequent Event [Line Items]                          
Investment, Type [Extensible Enumeration]                     Fraser Steel LLC Onsight Industries, LLC Customer Expressions Corp
Preferred Equity [Member] | Subsequent Events                          
Subsequent Event [Line Items]                          
Investment, Type [Extensible Enumeration]                     Fraser Steel LLC    
Customer Expressions Corp | First Lien Debt | Subsequent Events                          
Subsequent Event [Line Items]                          
Investments at cost                         $ 15,000
Customer Expressions Corp | Common Equity | Subsequent Events                          
Subsequent Event [Line Items]                          
Investments at cost                         $ 750
Onsight Industries, LLC | First Lien Debt | Subsequent Events                          
Subsequent Event [Line Items]                          
Investments at cost                       $ 19,000  
Onsight Industries, LLC | Common Equity | Subsequent Events                          
Subsequent Event [Line Items]                          
Investments at cost                       380  
Onsight Industries, LLC | Revolving Loan | Subsequent Events | Maximum                          
Subsequent Event [Line Items]                          
Investment commitment amount                       $ 2,280  
Healthfuse, LLC | Subsequent Events                          
Subsequent Event [Line Items]                          
Investment, Type [Extensible Enumeration]       Preferred Equity [Member]                  
Total net realized gain (loss) on investments       $ 3,171                  
Medsurant Holdings, LLC | Subsequent Events                          
Subsequent Event [Line Items]                          
Total net realized gain (loss) on investments   $ 8,216                      
Fraser Steel LLC | First Lien Debt | Subsequent Events                          
Subsequent Event [Line Items]                          
Investments at cost                     $ 14,000    
Fraser Steel LLC | Common Equity | Subsequent Events                          
Subsequent Event [Line Items]                          
Investments at cost                     500    
Fraser Steel LLC | Revolving Loan | Subsequent Events | Maximum                          
Subsequent Event [Line Items]                          
Investment commitment amount                     2,000    
Fraser Steel LLC | Preferred Equity [Member] | Subsequent Events                          
Subsequent Event [Line Items]                          
Investments at cost                     $ 140    
Regular Dividends | Subsequent Events                          
Subsequent Event [Line Items]                          
Dividends to stockholders     $ 0.43                    
Supplemental Dividends | Subsequent Events                          
Subsequent Event [Line Items]                          
Dividends to stockholders     $ 0.11                    
Quarterly Dividends | Subsequent Events                          
Subsequent Event [Line Items]                          
Dividend payable date     Mar. 27, 2025                    
Dividend record date     Mar. 20, 2025                    
[1]

(a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[2]

(b) Equity ownership may be held in shares or units of companies related to the portfolio companies. The Company’s investments are generally classified as “restricted securities”, unless otherwise noted, as such term is defined under Regulation S-X Rule 6-03(f) or Securities Act Rule 144. As of December 31, 2024, the Company held restricted securities with an aggregate fair value of $1,090,506, or 166% of the Company's net assets.
[3]

(c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[4]

(a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[5]

(b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[6]

(c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[7] Includes unitranche investments, which account for 39.9% and 40.4% of our portfolio on a fair value and cost basis as of December 31, 2024, respectively. Includes unitranche investments, which account for 37.6% and 38.5% of our portfolio on a fair value and cost basis as of December 31, 2023, respectively.