v3.25.1
Summary of Significant Accounting Policies - Additional Information (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Loan
Equipment
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Loan
Equipment
Dec. 31, 2023
USD ($)
Disclosure Of Summary Of Significant Accounting Policies [Line Items]        
Fair value of companies investment percentage 99.10%      
Market index of investment securities $ 0      
Maturity period description original maturity of three months or less      
Total cash, cash equivalents and restricted cash shown in the Consolidated Statements of Cash Flows $ 8,386,000 $ 11,967,000 $ 9,627,000 $ 4,761,000
Cash and cash equivalents 8,386,000   9,627,000  
Restricted cash 0   $ 0  
Interest income 1,500,000 4,100,000    
Dividend income $ 800,000 $ 200,000    
Debt security payment due 90 days      
Number of portfolio companies loans | Loan 3   3  
Number of portfolio companies equipment financing | Equipment 2   2  
Non accrual cost $ 49,700,000   $ 43,300,000  
Fair value $ 15,200,000   $ 12,700,000  
Fair value of debt investment portfolio 0.90%   0.80%  
Debt instrument percentage     6.00%  
Investment percentage 15.90% 16.30%    
Percentage of net tax- exempt income 90.00%      
Uncertain tax position $ 0   $ 0  
Nondeductible federal excise tax 4.00%      
Ordinary income percentage 98.00%      
Capital gain net income percentage 98.20%      
Excise tax 4.00%      
Goldman Sachs Financial Square Government Institutional Fund        
Disclosure Of Summary Of Significant Accounting Policies [Line Items]        
Cash and cash equivalents $ 3,300,000   $ 3,800,000  
Minimum        
Disclosure Of Summary Of Significant Accounting Policies [Line Items]        
Cash and cash equivalents interest rate 3.00%      
Investment percentage 90.00%      
Maximum        
Disclosure Of Summary Of Significant Accounting Policies [Line Items]        
Cash and cash equivalents interest rate 6.00%