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Summary of Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Loan
Equipment
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Equipment
Loan
Dec. 31, 2022
USD ($)
Disclosure Of Summary Of Significant Accounting Policies [Line Items]        
Fair value of companies investment percentage 98.60%      
Market index of investment securities $ 0      
Maturity period description original maturity of three months or less      
Cash and cash equivalents $ 11,967,000   $ 4,761,000  
Total cash, cash equivalents and restricted cash shown in the Consolidated Statements of Cash Flows $ 11,967,000 $ 8,344,000 4,761,000 $ 10,612,000
Escrow Distribution period 1 year      
Escrow receivable balance $ 2,400,000   $ 2,400,000  
Interest income 4,100,000 300,000    
Dividend income $ 200,000 $ 0    
Debt security payment due 90 days      
Number of portfolio companies loans | Loan 4   3  
Number of portfolio companies equipment financing | Equipment 1   2  
Non accrual cost $ 67,500,000   $ 60,800,000  
Fair value $ 30,400,000   $ 43,200,000  
Fair value of debt investment portfolio 2.40%   3.50%  
Debt instrument percentage 6.00%      
Investment percentage 16.30% 16.90%    
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 $ 4,900,000   $ 3,100,000  
Minimum        
Disclosure Of Summary Of Significant Accounting Policies [Line Items]        
Investment percentage 90.00%