Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of schedule of investment Parenthetical (Details)

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CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of schedule of investment Parenthetical (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Investments in and Advances to Affiliates [Line Items]        
Investment cost $ 3,609,118 $ 3,247,033    
Investments, at fair value: $ 3,568,539 $ 3,248,046    
Control investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 5.99% 6.38%    
Investment cost $ 103,772 $ 103,182    
Investments, at fair value: $ 111,259 $ 115,004 $ 90,923 $ 76,458
Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 5.37% 5.74%    
Investment cost $ 81,359 $ 80,769    
Investments, at fair value: $ 99,725 $ 103,487 83,850 68,416
Control investments | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 0.62% 0.64%    
Investment cost $ 22,413 $ 22,413    
Investments, at fair value: 11,534 11,517 7,073 8,042
Control investments | Coronado Aesthetics, LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 186   297  
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 185 260 292 313
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 1 2 5 6
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 250 250    
Investments, at fair value: $ 186 $ 262    
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | 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: $ 1 $ 2    
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | 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: 185 260    
Control investments | Gibraltar Business Capital, LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 56,811   44,392  
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 35,068 34,478 24,613 21,700
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value:     19,779 15,244
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Member Units        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 21,743 28,034    
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 69,074 68,484    
Investments, at fair value: $ 56,811 $ 62,512    
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 2026-09 2026-09    
Interest rate and floor, fixed 3.45% 11.50%    
Investment, interest rate, paid in kind 8.05%      
Principal amount $ 25,509 $ 25,000    
Investment cost 25,224 24,663    
Investments, at fair value: $ 25,224 $ 24,663    
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 2026-09 2026-09    
Interest rate and floor, fixed 11.95% 11.95%    
Principal amount $ 10,000 $ 10,000    
Investment cost 9,844 9,815    
Investments, at fair value: $ 9,844 $ 9,815    
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 $ 34,006 $ 34,006    
Investments, at fair value: 21,743 28,034    
Control investments | Hercules Adviser LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 42,728   39,161  
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 12,000 12,000 12,000 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: 30,728 28,713 27,161 19,153
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 12,035 12,035    
Investments, at fair value: $ 42,728 $ 40,713    
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Maturity Date 2025-06 2025-06    
Interest rate and floor, fixed 5.00% 5.00%    
Principal amount $ 12,000 $ 12,000    
Investment cost 12,000 12,000    
Investments, at fair value: $ 12,000 $ 12,000    
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 $ 35 $ 35    
Investments, at fair value: 30,728 28,713    
Control investments | Tectura Corporation        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 11,534   7,073  
Control investments | Tectura Corporation | Other Control Investments | Senior Secured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 8,250 8,250 $ 7,073 8,042
Control investments | Tectura Corporation | Other Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 3,279 3,263   0
Control investments | Tectura Corporation | Other Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 5 4   $ 0
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 22,413 22,413    
Investments, at fair value: $ 11,534 $ 11,517    
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments | Senior Secured Debt        
Investments in and Advances to Affiliates [Line Items]        
Maturity Date 2024-07 2024-07    
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: $ 8,250 $ 8,250    
Control investments | Tectura Corporation | Consumer & Business Services | 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: $ 5 $ 4    
Control investments | Tectura Corporation | Consumer & Business Services | 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: $ 12 $ 12    
Control investments | Tectura Corporation | Consumer & Business Services | 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: $ 3,267 $ 3,251