Annual report [Section 13 and 15(d), not S-K Item 405]

INVESTMENTS - Narrative (Details)

v3.26.1
INVESTMENTS - Narrative (Details)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
USD ($)
industry
portfolioCompany
state
Mar. 31, 2025
USD ($)
Summary of Investment Holdings [Line Items]    
Number of investment portfolio company | portfolioCompany 29  
Number of states which have invested in the company location | state 20  
Number of industries that have made investments | industry 16  
Fair Value $ 1,309,248 [1] $ 979,320 [2]
Uncollectible receivables allowance, minimum required day for uncollectible adjustment 90 days  
Gross receivables from portfolio companies $ 2,600 2,300
Allowance for uncollectible receivables 1,400 $ 1,700
Five Largest Portfolio Investments | Investment Portfolio Benchmark | Customer Concentration Risk    
Summary of Investment Holdings [Line Items]    
Fair Value $ 582,600  
Percentage of Total Investments 44.50%  
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $428.5 million; cumulative gross unrealized depreciation for federal income tax purposes is $173.7 million. Cumulative net unrealized appreciation is $254.8 million, based on a tax cost of $1.1 billion.
[2] Cumulative gross unrealized appreciation for federal income tax purposes is $183.3 million; cumulative gross unrealized depreciation for federal income tax purposes is $144.9 million. Cumulative net unrealized appreciation is $38.5 million, based on a tax cost of $940.9 million.