Annual report pursuant to Section 13 and 15(d)

INVESTMENTS - Narrative (Details)

v3.24.3
INVESTMENTS - Narrative (Details)
$ in Thousands
 1 Months Ended 2 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
portfolioCompany
state
investment
industry
Jul. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
May 31, 2024
USD ($)
Apr. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Feb. 29, 2024
USD ($)
Jan. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Nov. 30, 2023
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
portfolioCompany
state
investment
industry
Sep. 30, 2023
USD ($)
investment
Sep. 30, 2022
USD ($)
Summary of Investment Holdings [Line Items]                            
Number of proprietary investments | investment 47                     47 47  
Fair Value $ 796,260 [1]                     $ 796,260 [1] $ 704,815 [2]  
Purchase of investments                       177,649 175,477 $ 274,898
Financial support to investee, not provided 57,594                     57,594 45,231  
Investment owned, at cost $ 771,011 [1]                     $ 771,011 [1] 722,269 [2]  
Number of investment portfolio company | portfolioCompany 49                     49    
Number of states which have invested in the company location | state 22                     22    
Number of industries that have made investments | industry 13                     13    
Weighted average investment owned, at cost, amount $ 15,700                     $ 15,700 14,200  
Uncollectible receivables allowance, minimum required day for uncollectible adjustment                       90 days    
Gross receivables from portfolio companies 1,700                     $ 1,700 800  
Allowance for uncollectible receivables 75                     75 9  
Unused line of credit commitments                            
Summary of Investment Holdings [Line Items]                            
Financial support to investee, not provided 42,601                     42,601 32,349  
Delayed Draw Term Loan (DDTL)                            
Summary of Investment Holdings [Line Items]                            
Financial support to investee, not provided 14,150                     14,150 12,039  
Investment Portfolio Benchmark | Customer Concentration Risk | Five Largest Portfolio Investments                            
Summary of Investment Holdings [Line Items]                            
Fair Value 232,700                     $ 232,700 $ 176,900  
Concentration risk, percentage                       29.20% 25.10%  
Principal or Proprietary Transactions                            
Summary of Investment Holdings [Line Items]                            
Fair Value $ 792,900                     $ 792,900 $ 695,100  
Principal or Proprietary Transactions | Investment Portfolio Benchmark | Investment Type Concentration Risk                            
Summary of Investment Holdings [Line Items]                            
Concentration risk, percentage                       99.60% 98.60%  
Syndicated Investments                            
Summary of Investment Holdings [Line Items]                            
Number of proprietary investments | investment 2                     2 4  
Fair Value $ 3,300                     $ 3,300 $ 9,700  
Syndicated Investments | Investment Portfolio Benchmark | Investment Type Concentration Risk                            
Summary of Investment Holdings [Line Items]                            
Concentration risk, percentage                       0.40% 1.40%  
Quality Environmental Midco, Inc.                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments             $ 5,000     $ 11,000        
Financial support to investee, not provided                   2,000        
Financial support to investee             3,000              
Cafe Zupas                            
Summary of Investment Holdings [Line Items]                            
Financial support to investee, not provided                   10,500        
Net proceeds from the sale of investments                   7,300        
Cafe Zupas | Delayed Draw Term Loan (DDTL)                            
Summary of Investment Holdings [Line Items]                            
Financial support to investee                 $ 1,400          
PIC 360, LLC                            
Summary of Investment Holdings [Line Items]                            
Realized investment gains                   $ 300        
ALS Education, LLC                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments                 14,300          
Leadpoint Business Services, LLC                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments                 12,000          
Salt & Straw, LLC                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments                 7,000          
Financial support to investee                 $ 2,900          
SpaceCo Holdings, LLC                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments                     $ 13,500      
Perimeter Solutions Group                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments             $ 15,000              
Trowbridge Chicago, LLC                            
Summary of Investment Holdings [Line Items]                            
Net proceeds from the sale of investments 300         $ 8,400                
Realized investment gains           200                
Investment company, prepayment fee           $ 200                
Total Access Elevator, LLC                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments         $ 7,300                  
Total Access Elevator, LLC | Unused line of credit commitments                            
Summary of Investment Holdings [Line Items]                            
Financial support to investee, not provided         3,000                  
Total Access Elevator, LLC | Delayed Draw Term Loan (DDTL)                            
Summary of Investment Holdings [Line Items]                            
Financial support to investee, not provided         2,500                  
Home Healthcare, LLC ("Giving Home")                            
Summary of Investment Holdings [Line Items]                            
Net proceeds from the sale of investments         29,700                  
Investment company, prepayment fee         900                  
Proceeds from equity         $ 2,500                  
Gray Matter Systems, LLC                            
Summary of Investment Holdings [Line Items]                            
Net proceeds from the sale of investments       $ 14,000                    
Proceeds from disposition of investment, prepayment fees       200                    
Pansophic Learning, Ltd.                            
Summary of Investment Holdings [Line Items]                            
Net proceeds from the sale of investments       33,000                    
RPM Freight Systems, LLC                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments       20,000                    
Financial support to investee, not provided       5,000                    
Funko Acquisition Holdings, LLC                            
Summary of Investment Holdings [Line Items]                            
Fair Value                         $ 22  
Realized investment gains       2                    
Investment owned, at cost       $ 21                    
Workforce QA LLC                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments     $ 7,400                      
Turn Key Health Clinics, LLC                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments   $ 6,500                        
Financial support to investee   2,000                        
Arc Drilling Holdings LLC – Common Stock                            
Summary of Investment Holdings [Line Items]                            
Purchase of investments 13,500                          
Arc Drilling Holdings LLC – Common Stock | Unused line of credit commitments                            
Summary of Investment Holdings [Line Items]                            
Financial support to investee, not provided 4,000                     $ 4,000    
Amount funded $ 900                     $ 900    
CPM Holdings, Inc                            
Summary of Investment Holdings [Line Items]                            
Net proceeds from the sale of investments               $ 3,000            
Tailwind Smith Cooper Immediate Corporation                            
Summary of Investment Holdings [Line Items]                            
Net proceeds from the sale of investments   $ 5,000                        
[1] Cumulative gross unrealized depreciation for federal income tax purposes is $66.1 million; cumulative gross unrealized appreciation for federal income tax purposes is $85.8 million. Cumulative net unrealized appreciation is $19.7 million, based on a tax cost of $776.5 million.
[2] Cumulative gross unrealized depreciation for federal income tax purposes is $56.9 million; cumulative gross unrealized appreciation for federal income tax purposes is $33.7 million. Cumulative net unrealized depreciation is $23.2 million, based on a tax cost of $728.0 million.