Quarterly report [Sections 13 or 15(d)]

CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Schedule of Investment (Details)

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CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Schedule of Investment (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 212.03% [1] 0.00% [2]    
Investment cost $ 4,770,369 [3] $ 4,467,968    
Investments, at fair value: $ 4,721,987 $ 4,466,647    
Control investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 5.22% 5.19%    
Investment cost $ 108,145 $ 105,409    
Investments, at fair value: $ 116,248 $ 115,051 $ 115,734 $ 113,179
Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 4.78% 4.77%    
Investment cost $ 85,732 $ 82,996    
Investments, at fair value: $ 106,462 $ 105,710 103,964 101,522
Control investments | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 0.44% 0.42%    
Investment cost $ 22,413 $ 22,413    
Investments, at fair value: 9,786 9,341 11,770 11,657
Control investments | Coronado Aesthetics, LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 158   47  
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 158 218 47 69
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 0 0 0 0
Control investments | Coronado Aesthetics, LLC | Diversified Financial Services | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 250 250    
Investments, at fair value: $ 158 $ 218    
Control investments | Coronado Aesthetics, LLC | Diversified Financial Services | Majority Owned Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 180,000 180,000    
Investment cost $ 0 $ 0    
Investments, at fair value: $ 0 $ 0    
Control investments | Coronado Aesthetics, LLC | Diversified Financial Services | Preferred Series A | Majority Owned Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 5,000,000 5,000,000    
Investment cost $ 250 $ 250    
Investments, at fair value: 158 218    
Control investments | Gibraltar Business Capital, LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 62,167   58,900  
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 38,291 38,255 36,790 36,212
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Member Units        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 23,876 23,963 22,110 23,051
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 70,447 70,711    
Investments, at fair value: $ 62,167 $ 62,218    
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt One        
Investments in and Advances to Affiliates [Line Items]        
Maturity Date 2029-07 2029-07    
Interest rate and floor, fixed 11.50% 3.45%    
Investment, interest rate, paid in kind   8.05%    
Principal amount $ 28,805 $ 28,805    
Investment cost 28,439 28,412    
Investments, at fair value: $ 28,439 $ 28,412    
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt Two        
Investments in and Advances to Affiliates [Line Items]        
Maturity Date 2029-07 2029-07    
Interest rate and floor, fixed 11.95% 11.95%    
Principal amount $ 10,000 $ 10,000    
Investment cost 9,852 9,843    
Investments, at fair value: $ 9,852 $ 9,843    
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments | Member Units        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 1 1    
Investment cost $ 32,156 $ 32,456    
Investments, at fair value: 23,876 23,963    
Control investments | Hercules Adviser LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 44,137   45,017  
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 3,000 0 0 12,000
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Member Units        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 41,137 43,274 45,017 30,190
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 15,035 12,035    
Investments, at fair value: $ 44,137 $ 43,274    
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Maturity Date 2027-03      
Interest rate and floor, fixed 6.75%      
Principal amount $ 3,000      
Investment cost 3,000      
Investments, at fair value: $ 3,000      
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments | Member Units        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 1 1    
Investment cost $ 12,035 $ 12,035    
Investments, at fair value: 41,137 43,274    
Control investments | Tectura Corporation        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 9,786   11,770  
Control investments | Tectura Corporation | Other Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 1,703 1,250 3,736 3,623
Control investments | Tectura Corporation | Other Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 0 0 2 7
Control investments | Tectura Corporation | Other Control Investments | Senior Secured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 8,083 8,091 $ 8,032 $ 8,027
Control investments | Tectura Corporation | System Software | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 22,413 22,413    
Investments, at fair value: $ 9,786 $ 9,341    
Control investments | Tectura Corporation | System Software | Other Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 414,994,863 414,994,863    
Investment cost $ 900 $ 900    
Investments, at fair value: $ 0 $ 0    
Control investments | Tectura Corporation | System Software | Other Control Investments | Senior Secured Debt        
Investments in and Advances to Affiliates [Line Items]        
Maturity Date 2027-01 2027-01    
Interest rate and floor, fixed 8.25% 8.25%    
Principal amount $ 8,250 $ 8,250    
Investment cost 8,250 8,250    
Investments, at fair value: $ 8,083 $ 8,091    
Control investments | Tectura Corporation | System Software | Preferred Series BB | Other Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 1,000,000 1,000,000    
Investment cost $ 0 $ 0    
Investments, at fair value: $ 0 $ 0    
Control investments | Tectura Corporation | System Software | Series C Preferred Stock | Other Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 3,235,298 3,235,298    
Investment cost $ 13,263 $ 13,263    
Investments, at fair value: $ 1,703 $ 1,250    
[1] Value as a percent of net assets. All amounts are stated in U.S. Dollars unless otherwise noted. The Company uses the Standard Industrial Code for classifying the industry grouping of its portfolio companies.
[2] Value as a percent of net assets. All amounts are stated in U.S. Dollars unless otherwise noted. The Company uses the Standard Industrial Code for classifying the industry grouping of its portfolio companies.
[3] Gross unrealized appreciation, gross unrealized depreciation, and net unrealized depreciation for federal income tax purposes totaled $90.1 million, $139.7 million and $49.6 million, respectively. The tax cost of investments is $4.8 billion