Annual report pursuant to Section 13 and 15(d)

INVESTMENTS - Narrative (Details)

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INVESTMENTS - Narrative (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
portfolioCompany
industry
state
Oct. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Aug. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
May 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
portfolioCompany
industry
state
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Summary of Investment Holdings [Line Items]                  
Purchase of investments             $ 183,924 $ 133,756 $ 92,738
Dividend income:             1,907 10,865 2,595
Cost $ 854,290 [1]           854,290 [1] 720,630 [2]  
Success fee income:             3,605 10,402 10,308
Principal repayments of investments             28,000 52,300 51,398
Net realized gain (loss):             $ 30,256 10,753 $ 12,444
Number of investment portfolio company | portfolioCompany 24           24    
Number of states which have invested in the company location | state 18           18    
Number of industries that have made investments | industry 16           16    
Investments owned, fair value $ 920,504 [1]           $ 920,504 [1] 753,543 [2]  
Uncollectible receivables allowance, minimum required day for uncollectible adjustment             90 days    
Gross receivables from portfolio companies 2,200           $ 2,200 2,200  
Allowance for uncollectible receivables 1,400           1,400 1,600  
Investment Portfolio Benchmark | Customer Concentration Risk | Five Largest Portfolio Investments                  
Summary of Investment Holdings [Line Items]                  
Investments owned, fair value 393,500           $ 393,500    
Concentration risk, percentage             42.70%    
Secured First Lien Debt                  
Summary of Investment Holdings [Line Items]                  
Cost 513,425           $ 513,425 471,439  
Investments owned, fair value 474,856           474,856 437,517  
Preferred Equity                  
Summary of Investment Holdings [Line Items]                  
Cost 145,070           145,070 149,099  
Investments owned, fair value 213,480           213,480 222,585  
Secured Second Lien Debt                  
Summary of Investment Holdings [Line Items]                  
Cost 144,958           144,958 84,158  
Investments owned, fair value 138,703           138,703 75,734  
Common Equity/ Equivalents                  
Summary of Investment Holdings [Line Items]                  
Cost 50,837           50,837 15,934  
Investments owned, fair value 93,465           93,465 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 $ 13,400  
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 Luxury Villas, 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            
SFEG Holdings, Inc                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments   $ 64,700              
Cost   4,800              
Investments owned, fair value   8,600              
SFEG Holdings, Inc | Secured Second Lien Debt                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments   39,000              
SFEG Holdings, Inc | Common Equity/ Equivalents                  
Summary of Investment Holdings [Line Items]                  
Purchase of investments   25,700              
Counsel Press, Inc.,                  
Summary of Investment Holdings [Line Items]                  
Realized gain on preferred equity   43,500              
Success fee income:   1,400              
Principal repayments of investments   $ 27,500              
The Mountain                  
Summary of Investment Holdings [Line Items]                  
Net realized gain (loss): $ (14,700)                
[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.
[2] 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.