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
May 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
portfolioCompany
state
industry
Jun. 30, 2023
USD ($)
Mar. 31, 2024
USD ($)
Summary of Investment Holdings [Line Items]        
Principal repayments of investments   $ 3,000 $ 0  
Number of investment portfolio company | portfolioCompany   23    
Number of states which have invested in the company location | state   18    
Number of industries that have made investments | industry   15    
Fair Value   $ 899,138   $ 920,504 [1]
Uncollectible receivables allowance, minimum required day for uncollectible adjustment   90 days    
Gross receivables from portfolio companies   $ 2,000   2,200
Allowance for uncollectible receivables   1,500   $ 1,400
Five Largest Portfolio Investments | Investment Portfolio Benchmark | Customer Concentration Risk        
Summary of Investment Holdings [Line Items]        
Fair Value   $ 384,100    
Concentration risk, percentage   42.70%    
Funko Acquisition Holdings, LLC        
Summary of Investment Holdings [Line Items]        
Principal repayments of investments $ 21      
Realized gain on preferred equity $ 2      
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $180.5 million; cumulative gross unrealized depreciation for federal income tax purposes is $115.8 million. Cumulative net unrealized appreciation is $64.7 million, based on a tax cost of $855.8 million.