v3.26.1
Borrowings - Narrative (Details)
3 Months Ended 6 Months Ended
Apr. 06, 2022
USD ($)
Jun. 30, 2026
USD ($)
lender
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
lender
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Debt Instrument [Line Items]            
Total commitment   $ 150,000,000   $ 150,000,000   $ 150,000,000
Revolving credit facility   58,000,000   58,000,000   66,000,000
Deferred credit facility costs   1,145,000   1,145,000   1,374,000
Outstanding borrowings   131,943,000   131,943,000   140,881,000
Level 3            
Debt Instrument [Line Items]            
Outstanding borrowings   131,943,000   131,943,000   140,881,000
2027 Notes | Senior Notes            
Debt Instrument [Line Items]            
Total commitment   75,000,000   75,000,000   75,000,000
Face amount $ 75,000,000.0          
Interest rate 5.86%          
Current borrowing capacity $ 25,000,000          
Asset coverage ratio, minimum 1.50          
Interest coverage ratio, minimum 1.25          
Minimum stockholders' equity balance $ 142,800,000          
Upward adjustment, percent of issuance proceeds 65.00%          
Deferred issuance costs   200,000   200,000   300,000
Debt term 5 years          
2027 Notes | Senior Notes | Level 3            
Debt Instrument [Line Items]            
Outstanding borrowings   73,900,000   73,900,000   74,900,000
2027 Notes | Senior Notes | Internal Noninvestment Grade            
Debt Instrument [Line Items]            
Interest rate 6.86%          
Revolving Credit Facility | Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Total commitment   $ 75,000,000.0   $ 75,000,000.0   75,000,000
Number of lenders | lender   1   1    
Accordion feature, higher borrowing capacity option   $ 125,000,000.0   $ 125,000,000.0    
Advance rate       55.00%    
Debt instrument, variable interest rate, type flag       Secured Overnight Financing Rate (SOFR) [Member]    
Basis spread on variable rate       0.50%    
Revolving credit facility   58,000,000.0   $ 58,000,000.0   66,000,000.0
Deferred credit facility costs   1,100,000   1,100,000   1,400,000
Credit facility, average outstanding borrowings   $ 51,600,000 $ 92,900,000 $ 51,000,000.0 $ 90,500,000  
Credit facility, average interest rate   6.72% 7.55% 6.72% 7.55%  
Assets pledged as collateral   $ 222,600,000   $ 222,600,000   219,200,000
Outstanding borrowings   58,000,000   58,000,000   66,000,000
Revolving Credit Facility | Credit Facility | Line of Credit | Level 3            
Debt Instrument [Line Items]            
Outstanding borrowings   $ 58,000,000   $ 58,000,000   $ 66,000,000
Revolving Credit Facility | Credit Facility | Line of Credit | Revolving Period            
Debt Instrument [Line Items]            
Basis spread on variable rate       3.05%    
Revolving Credit Facility | Credit Facility | Line of Credit | Amortization Period            
Debt Instrument [Line Items]            
Basis spread on variable rate       4.05%