Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Narrative (Details)

v3.23.3
INVESTMENTS - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2023
USD ($)
portfolioCompany
industry
state
Aug. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
May 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
portfolioCompany
industry
state
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
portfolioCompany
industry
state
Sep. 30, 2022
USD ($)
Mar. 31, 2023
USD ($)
Summary of Investment Holdings [Line Items]                  
Purchase of investments             $ 114,788 $ 102,046  
Dividend income         $ 0 $ 4,825 1,907 $ 6,381  
Cost $ 834,798       $ 834,798   $ 834,798   $ 720,630 [1]
Number of investment portfolio company | portfolioCompany 26       26   26    
Number of states which have invested in the company location | state 19       19   19    
Number of industries that have made investments | industry 16       16   16    
Fair Value $ 915,636       $ 915,636   $ 915,636   753,543 [1]
Allowance for uncollectible receivables 1,500       1,500   $ 1,500   1,600
Uncollectible receivables allowance, minimum required day for uncollectible adjustment             90 days    
Gross receivables from portfolio companies 2,300       2,300   $ 2,300   2,200
Five Largest Portfolio Investments | Investment Portfolio Benchmark | Customer Concentration Risk                  
Summary of Investment Holdings [Line Items]                  
Fair Value 364,900       364,900   $ 364,900    
Concentration risk, percentage             39.90%    
Secured First Lien Debt                  
Summary of Investment Holdings [Line Items]                  
Cost 541,539       541,539   $ 541,539   471,439
Fair Value 508,504       508,504   508,504   437,517
Preferred Equity                  
Summary of Investment Holdings [Line Items]                  
Cost 163,787       163,787   163,787   149,099
Fair Value 267,596       267,596   267,596   222,585
Secured Second Lien Debt                  
Summary of Investment Holdings [Line Items]                  
Cost 109,158       109,158   109,158   84,158
Fair Value 102,747       102,747   102,747   75,734
Common Equity/ Equivalents                  
Summary of Investment Holdings [Line Items]                  
Cost 20,314       20,314   20,314   15,934
Fair Value 36,789       $ 36,789   36,789   $ 17,707
Home Concepts Acquisition, Inc                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments       $ 15,300          
Home Concepts Acquisition, Inc | Secured First Lien Debt                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments       12,000          
Home Concepts Acquisition, Inc | Preferred Equity                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments       $ 3,300          
Old World Christmas, Inc.                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments     $ 2,500            
Proceeds from equity     2,200            
Dividend income     1,900            
Realized gain on preferred equity     300       $ 300    
Nth Degree Investment Group, LLC                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments     30,000            
Nth Degree Investment Group, LLC | Secured Second Lien Debt                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments     25,000            
Nth Degree Investment Group, LLC | Common Equity/ Equivalents                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments     5,000            
Specialty Knives & Tools, LLC                  
Summary of Investment Holdings [Line Items]                  
Realized gain on preferred equity     900            
Net proceeds from the sale of investments     1,500            
Cost     $ 600            
Nocturne Villa Rentals, Inc.                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments   $ 18,700              
The E3 Company, LLC                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments 46,000                
The E3 Company, LLC | Secured First Lien Debt                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments 34,800                
The E3 Company, LLC | Preferred Equity                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments $ 11,200                
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $150.4 million; cumulative gross unrealized depreciation for federal income tax purposes is $119.3 million. Cumulative net unrealized appreciation is $31.1 million, based on a tax cost of $722.4 million.