Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Narrative (Details)

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INVESTMENTS - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
industry
portfolioCompany
investment
state
Nov. 30, 2023
USD ($)
Oct. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
industry
portfolioCompany
investment
state
Dec. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
investment
Summary of Investment Holdings [Line Items]            
Number of proprietary investments | investment 47     47    
Fair Value $ 749,985     $ 749,985   $ 704,815 [1]
Purchase of investments       57,998 $ 13,379  
Investment company, committed capital       $ 54,710   45,231
Number of investment portfolio company | portfolioCompany 51     51    
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 $ 14,900     $ 14,900   14,200
Debt investments with maturity dates prior to period end 200     200    
Gross receivables from portfolio companies 900     900   800
Allowance for uncollectible receivables 14     14   9
Targus Cayman HoldCo Ltd.            
Summary of Investment Holdings [Line Items]            
Net proceeds from the sale of investments     $ 8,000      
Realized investment gains     $ 5,900      
Environmental Midco, Inc            
Summary of Investment Holdings [Line Items]            
Purchase of investments   $ 11,000        
Investment company, committed capital   2,000        
Salt & Straw, LLC            
Summary of Investment Holdings [Line Items]            
Purchase of investments 7,000          
Investment company, delayed draw term loan commitment 2,900          
Leadpoint Business Services, LLC,            
Summary of Investment Holdings [Line Items]            
Purchase of investments 12,000          
ALS Education, LLC            
Summary of Investment Holdings [Line Items]            
Purchase of investments 14,300          
Cafe Zupas            
Summary of Investment Holdings [Line Items]            
Investment company, committed capital   10,500        
Investment company, delayed draw term loan commitment   1,400        
Net proceeds from the sale of investments   7,300        
PIC 360            
Summary of Investment Holdings [Line Items]            
Realized investment gains   $ 300        
Principal or Proprietary Transactions            
Summary of Investment Holdings [Line Items]            
Fair Value $ 739,900     $ 739,900   $ 695,100
Syndicated Investments            
Summary of Investment Holdings [Line Items]            
Number of proprietary investments | investment 4     4   4
Fair Value $ 10,100     $ 10,100   $ 9,700
Investment Portfolio Benchmark | Investment Type Concentration Risk | Principal or Proprietary Transactions            
Summary of Investment Holdings [Line Items]            
Concentration risk, percentage       98.70%   98.60%
Investment Portfolio Benchmark | Investment Type Concentration Risk | Syndicated Investments            
Summary of Investment Holdings [Line Items]            
Concentration risk, percentage       1.30%   1.40%
Investment Portfolio Benchmark | Customer Concentration Risk | Five Largest Portfolio Investments            
Summary of Investment Holdings [Line Items]            
Fair Value $ 185,700     $ 185,700   $ 176,900
Concentration risk, percentage       24.80%   25.10%
[1] Investment was exited subsequent to December 31, 2023. Refer to Note 12 – Subsequent Events in the accompanying Notes to the Consolidated Financial Statements for additional information.