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Organization and Basis of Presentation - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 05, 2022
USD ($)
BusinessDays
Jan. 29, 2020
USD ($)
shares
Jan. 16, 2020
USD ($)
shares
Sep. 27, 2019
USD ($)
shares
Mar. 31, 2024
USD ($)
shares
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
shares
Aug. 05, 2021
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Issuance of common stock, net of issuance costs, shares | shares       10        
Issuance of common stock, net of issuance costs       $ 150 $ 24,240,000 $ 4,048,000    
Debt instrument percentage         6.00%      
Percentage of capital contribution invested in joint venture common equity 30.00%              
Percentage of capital contribution invested in joint venture debt notes 70.00%              
Percentage of Secured loan and equipment financing advance offered to purchase 40.00%              
Percentage of principal amount of loan or equipment financing advance 100              
Percentage of fee for loan and advance 50.00%              
Loan or advance fee payable number of days | BusinessDays 2              
Remaining percentage of fee for loan or advance 50.00%              
Percentage of daily average aggregate value of outstanding loans and equipment financings 75              
Common stock, shares issued | shares     8,333,333   48,643,194   46,323,712  
Proceeds from issuance of common stock     $ 114,400,000   $ 24,240,000 4,048,000    
Common stock, value         49,000   $ 46,000  
Net proceeds for the sale of investments         $ 52,400,000   146,200,000  
Overallotment Option                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Common stock, shares issued | shares   1,333,333 8,333,333          
Proceeds from issuance of common stock   $ 20,000,000 $ 125,000,000          
Private Offerings | Legacy Funds                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Common stock, shares issued | shares     9,183,185          
Common stock, value     $ 137,700,000          
Payment of common stock value in cash     $ 108,700,000          
Private Offerings | Equity interests                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Common stock, shares issued | shares     533,332          
Common stock, value     $ 8,000,000          
Payment of common stock value in cash     $ 2,000,000          
Maximum                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Percentage of Secured loan and equipment financing advance offered to purchase 25.00%              
Trinity Capital Holdings                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Percentage of equity interests acquired         100.00%      
i 40 LLC                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Initally contributed capital $ 21,400,000              
JV Partner                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Initally contributed capital $ 150,000,000              
Joint venture ownership percentage         87.50%      
Trinity Investor J V I L L C                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Initally contributed capital         $ 13,400,000   11,000,000  
Total Investments at fair value         202,000,000   151,600,000  
Unfunded capital commitment         8,000,000   10,400,000  
Trinity Investor J V I L L C | Debt                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Total Investments at fair value         9,400,000   7,700,000  
Trinity Investor J V I L L C | Equity                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Total Investments at fair value         $ 4,000,000   3,300,000  
Senior Credit Corp 2022 LLC                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Joint venture ownership percentage         12.50%      
Corporate Joint Venture | Other assets                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Other receivables         $ 1,000,000   $ 800,000  
Corporate Joint Venture | Fee Income                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Origination and administrative agent fees         $ 900,000 $ 500,000    
8.5% Notes                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Debt instrument percentage 8.50%              
7.00% Notes due 2025                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Debt instrument percentage     7.00%          
7.00% Notes due 2025 | Private Offerings                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Proceeds from issuance of common stock     $ 125,000,000          
Trinity Funding 1, LLC | Credit Suisse Credit Facility                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Credit facility     $ 300,000,000          
TrinCap Funding, LLC | KeyBank Credit Facility                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Credit facility               $ 350,000,000