Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Narrative (Details)

v3.23.2
INVESTMENTS - Narrative (Details)
 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
state
industry
investment
portfolioCompany
May 31, 2023
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Apr. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jan. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 31, 2022
USD ($)
Nov. 30, 2022
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2023
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state
industry
investment
portfolioCompany
Jun. 30, 2022
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Sep. 30, 2022
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investment
Summary of Investment Holdings [Line Items]                        
Number of proprietary investments | investment 47                 47   46
Investments owned, fair value $ 715,324,000                 $ 715,324,000   $ 649,615,000
Purchase of investments                   148,084,000 $ 188,851,000  
Line of credit commitment                   63,908,000   74,846,000
Cost $ 735,182,000                 $ 735,182,000   656,053,000
Number of investment portfolio company | portfolioCompany 52                 52    
Number of states which have invested in the company location | state 24                 24    
Number of industries that have made investments | industry 12                 12    
Weighted average investment owned, at cost, amount $ 14,100,000                 $ 14,100,000   12,600,000
Uncollectible receivables allowance, minimum required day for uncollectible adjustment                   90 days    
Gross receivables from portfolio companies 900,000                 $ 900,000   500,000
Allowance for uncollectible receivables 0                 0   0
Leeds Novamark Capital I, L.P                        
Summary of Investment Holdings [Line Items]                        
Investments owned, fair value 200,000                 200,000    
Proceeds from equity               $ 6,000,000        
Realized investment gains               $ 4,400,000        
R2i Holdings, LLC                        
Summary of Investment Holdings [Line Items]                        
Net proceeds from the sale of investments           $ 19,200,000            
NeoGraf Solutions, LLC                        
Summary of Investment Holdings [Line Items]                        
Purchase of investments         $ 29,000,000              
Line of credit commitment         $ 4,500,000              
Salt & Straw, LLC                        
Summary of Investment Holdings [Line Items]                        
Purchase of investments                 $ 6,300,000      
Leadpoint Business Services, LLC                        
Summary of Investment Holdings [Line Items]                        
Purchase of investments       $ 13,500,000                
Line of credit commitment       $ 5,500,000                
Funded line of credit   $ 5,500,000                    
Technical Resource Management, LLC                        
Summary of Investment Holdings [Line Items]                        
Purchase of investments     $ 25,000,000                  
Line of credit commitment     3,000,000                  
Investment company, delayed draw term loan commitment     2,500,000                  
HH-Inspire Acquisition, Inc.                        
Summary of Investment Holdings [Line Items]                        
Purchase of investments 3,400,000   16,800,000                  
Cost     35,500,000                  
Investment company, prepayment fee     200,000                  
OCI, LLC                        
Summary of Investment Holdings [Line Items]                        
Purchase of investments   $ 22,000,000                    
PIC 360, LLC                        
Summary of Investment Holdings [Line Items]                        
Investments owned, fair value 300,000                 $ 300,000    
Realized investment gains 3,700,000                      
Trowbridge Chicago, LLC                        
Summary of Investment Holdings [Line Items]                        
Purchase of investments 6,500,000                      
Line of credit commitment 2,000,000                      
Investment company, delayed draw term loan commitment 5,300,000                      
Targus Cayman HoldCo Ltd.                        
Summary of Investment Holdings [Line Items]                        
Realized investment gains             $ 5,900,000          
Net proceeds from the sale of investments             8,000,000          
B. Riley Financial, Inc. – Term Debt                        
Summary of Investment Holdings [Line Items]                        
Net proceeds from the sale of investments $ 2,400,000                      
Cost             $ 2,400,000          
Investment, interest rate, paid in cash 6.75%           6.75%     6.75%    
Principal or Proprietary Transactions                        
Summary of Investment Holdings [Line Items]                        
Investments owned, fair value $ 704,900,000                 $ 704,900,000   630,800,000
Uncalled capital commitment                        
Summary of Investment Holdings [Line Items]                        
Line of credit commitment                   $ 843,000   $ 843,000
Uncalled capital commitment | HH-Inspire Acquisition, Inc.                        
Summary of Investment Holdings [Line Items]                        
Line of credit commitment     $ 1,800,000                  
Syndicated Investments                        
Summary of Investment Holdings [Line Items]                        
Number of proprietary investments | investment 5                 5   6
Investments owned, fair value $ 10,400,000                 $ 10,400,000   $ 18,800,000
Investment Portfolio Benchmark | Investment Type Concentration Risk | Principal or Proprietary Transactions                        
Summary of Investment Holdings [Line Items]                        
Concentration risk, percentage                   98.50%   97.10%
Investment Portfolio Benchmark | Investment Type Concentration Risk | Syndicated Investments                        
Summary of Investment Holdings [Line Items]                        
Concentration risk, percentage                   1.50%   2.90%
Investment Portfolio Benchmark | Customer Concentration Risk | Five Largest Portfolio Investments                        
Summary of Investment Holdings [Line Items]                        
Investments owned, fair value $ 172,000,000                 $ 172,000,000   $ 174,500,000
Concentration risk, percentage                   24.00%   26.90%