Quarterly report [Sections 13 or 15(d)]

INVESTMENTS - Narrative (Details)

v3.25.4
INVESTMENTS - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2025
USD ($)
portfolioCompany
industry
state
Nov. 30, 2025
USD ($)
Oct. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
portfolioCompany
industry
state
Dec. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
Summary of Investment Holdings [Line Items]            
Purchase of investments       $ 99,164 $ 151,616  
Committed capital, unfunded $ 69,717     69,717   $ 66,396
Cost $ 926,040     $ 926,040   876,614 [1]
Number of investment portfolio company | portfolioCompany 54     54    
Number of states which have invested in the company location | state 22     22    
Number of industries that have made investments | industry 16     16    
Fair Value $ 902,912     $ 902,912   859,124 [1]
Weighted average investment owned, at cost, amount 17,100     $ 17,100   15,900
Uncollectible receivables allowance, minimum required day for uncollectible adjustment       90 days    
Gross receivables from portfolio companies 2,700     $ 2,700   2,400
Allowance for uncollectible receivables 54     54   52
Total Access Elevator, LLC (“Total Access”)            
Summary of Investment Holdings [Line Items]            
Purchase of investments     $ 11,000      
Committed capital, unfunded     9,850      
Leadpoint Business Services, LLC            
Summary of Investment Holdings [Line Items]            
Net proceeds from the sale of investments     28,100      
Investment company, prepayment fee income     300      
Sokol            
Summary of Investment Holdings [Line Items]            
Cost     500      
Realized investment gains     1,800      
Sea Link International IRB, Inc            
Summary of Investment Holdings [Line Items]            
Net proceeds from the sale of investments     17,800      
Investment company, exit fee income     $ 200      
Turn Key Health Clinics, LLC            
Summary of Investment Holdings [Line Items]            
Purchase of investments   $ 15,000        
Committed capital, unfunded   5,000        
Increase in committed capital   1,000        
Sicilian Oven Restaurants LLC            
Summary of Investment Holdings [Line Items]            
Purchase of investments   $ 26,600        
Flexible Technology Solutions, LLC            
Summary of Investment Holdings [Line Items]            
Purchase of investments 11,300          
RPM Freight Systems, LLC            
Summary of Investment Holdings [Line Items]            
Purchase of investments 30,000          
Investment Portfolio Benchmark | Customer Concentration Risk | Five Largest Portfolio Investments            
Summary of Investment Holdings [Line Items]            
Fair Value $ 215,700     $ 215,700   $ 196,500
Concentration risk, percentage       23.90%   22.90%
[1] Cumulative gross unrealized depreciation for federal income tax purposes is $59.7 million; cumulative gross unrealized appreciation for federal income tax purposes is $34.1 million. Cumulative net unrealized depreciation is $25.5 million, based on a tax cost of $884.7 million.