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Debt - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 15, 2023
Dec. 15, 2022
Dec. 15, 2021
Dec. 15, 2020
Apr. 06, 2018
Apr. 05, 2018
May 31, 2022
Oct. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2019
Nov. 30, 2017
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]                              
Annualized weighted average cost of debt                         4.50% 3.90% 3.70%
Asset coverage ratio requirement                         150.00%    
Credit Facility payable, at fair value (cost-$168,830 and $219,400, respectively) (See Notes 5 and 11)                         $ 167,563 $ 218,851  
Percentage of public offering price per notes issued               101.50% 99.40%            
SOFR                              
Debt Instrument [Line Items]                              
Percentage points added to reference rate             260.00%                
Senior Securities                              
Debt Instrument [Line Items]                              
Asset coverage ratio requirement         150.00% 200.00%             178.00% 175.00%  
Truist Credit Facility                              
Debt Instrument [Line Items]                              
Annualized weighted average cost of debt                         4.70% 2.30%  
Credit Facility payable, at fair value (cost-$168,830 and $219,400, respectively) (See Notes 5 and 11)                         $ 366,000    
Basis points description                         Credit Facility bears interest at SOFR (or an alternative risk-free floating interest rate index) plus 225 basis points and, after the revolving period, the rate will reset to Base Rate (or an alternative risk-free floating interest rate index) plus 250 basis points for the remaining two years, maturing in August 2026    
Maturity date                         Aug. 31, 2026    
Revolving period end date                         2024-08    
Outstanding borrowings                         $ 168,800 $ 219,400  
Unused borrowing capacity                         $ 197,200 80,600  
Percentage of equity interest in funding                         100.00%    
Truist Credit Facility | SOFR                              
Debt Instrument [Line Items]                              
Basis points description                         225 basis points    
Two Thousand And Twenty Six Notes                              
Debt Instrument [Line Items]                              
Notes issued               $ 85,000 $ 100,000       $ 185,000    
Debt instrument, interest rate     4.25%                        
Interest payment terms                         Interest on the 2026 Notes is paid semi-annually on April 1 and October 1 of each year, at a rate of 4.25% per year, commencing October 1, 2021    
Debt instrument, periodic payment                         semi-annually    
Debt instrument, maturity date       Apr. 01, 2026                      
2023 Notes                              
Debt Instrument [Line Items]                              
Notes issued                       $ 138,600      
Notes issued                       $ 138,600 $ 97,000 117,800  
Debt instrument, interest rate                   4.30%          
Interest payment terms                         Interest on the 2023 Notes is payable semi-annually in arrears on June 15 and December 15 of each year, commencing June 15, 2018    
Debt instrument, periodic payment                         four annual installments    
Percentage of original principal amount payable     15.00% 15.00%                      
2023 Notes | Scenario Forecast                              
Debt Instrument [Line Items]                              
Percentage of original principal amount payable 55.00% 15.00%                          
SBA Debentures                              
Debt Instrument [Line Items]                              
Debt securitization amount                     $ 301,400        
2031 Asset-Backed Debt                              
Debt Instrument [Line Items]                              
Percentage of preferred shares of securitization issuer                     100.00%        
Preferred shares of securitization issuer                     $ 55,400        
Asset backed debt                         $ 228,000 228,000  
Unamortized fees                         $ 1,900 $ 2,500  
2031 Asset-Backed Debt | Class A-1 Senior Secured Floating Rate Loans                              
Debt Instrument [Line Items]                              
Debt instrument                     $ 78,500        
Reference rate description                         three-month LIBOR plus 1.8%    
Percentage points added to reference rate                         1.80%    
2031 Asset-Backed Debt | Class A-2 Senior Secured Fixed Rate Notes due 2031                              
Debt Instrument [Line Items]                              
Debt instrument, interest rate                     3.70%        
Debt instrument                     $ 15,000        
2031 Asset-Backed Debt | Class B-1 Senior Secured Floating Rate Notes due 2031                              
Debt Instrument [Line Items]                              
Debt instrument                     $ 14,000        
Reference rate description                         three-month LIBOR plus 2.9%    
Percentage points added to reference rate                     2.90%        
2031 Asset-Backed Debt | Class B-2 Senior Secured Fixed Rate Notes due 2031                              
Debt Instrument [Line Items]                              
Debt instrument, interest rate                     4.30%        
Debt instrument                     $ 16,000        
2031 Asset-Backed Debt | Class C 1 Secured Deferrable Floating Rate Notes due 2031                              
Debt Instrument [Line Items]                              
Debt instrument                     $ 19,000        
Reference rate description                         LIBOR plus 4.0%    
Percentage points added to reference rate                     4.00%        
2031 Asset-Backed Debt | Class C-2 Secured Deferrable Fixed Rate Notes due 2031                              
Debt Instrument [Line Items]                              
Debt instrument, interest rate                     5.40%        
Debt instrument                     $ 8,000        
2031 Asset-Backed Debt | Class D Secured Deferrable Floating Rate Loans due 2031                              
Debt Instrument [Line Items]                              
Debt instrument                     $ 18,000        
Reference rate description                         three-month LIBOR plus 4.8%    
Percentage points added to reference rate                     4.80%        
2031 Asset-Backed Debt | Class A 1 Senior Secured Floating Rate Notes due 2031                              
Debt Instrument [Line Items]                              
Debt instrument                     $ 77,500        
Reference rate description                         three-month LIBOR plus 1.8%    
Percentage points added to reference rate                     1.80%        
2031 Asset-Backed Debt | Class D Secured Deferrable Floating Rate Notes                              
Debt Instrument [Line Items]                              
Annualized weighted average cost of debt                         4.60% 2.60%  
Percentage of notes issued by securitization issuer                     100.00%