Annual report pursuant to Section 13 and 15(d)

Schedule 12-14s - CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES (Details)

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Schedule 12-14s - CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income $ 460,668 $ 321,688 $ 280,976
Fair value beginning balance 2,963,955    
Total net change in unrealized appreciation (depreciation) 25,010 (85,063) 3,311
Fair value ending balance 3,248,046 2,963,955  
Control investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 4,737 4,689  
Realized Gain (Loss) 0 0 0
Fair value beginning balance 76,458 73,504  
Gross Additions 29,175 3,232  
Gross Reductions (13,263) 0  
Total net change in unrealized appreciation (depreciation) 22,634 (278) (2,677)
Fair value ending balance 115,004 76,458 73,504
Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 4,047 3,999  
Realized Gain (Loss) 0 0  
Fair value beginning balance 68,416 65,235  
Gross Additions 15,912 3,232  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) 19,159 (51)  
Fair value ending balance 103,487 68,416 65,235
Control investments | Other Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 690 690  
Realized Gain (Loss) 0 0  
Fair value beginning balance 8,042 8,269  
Gross Additions 13,263 0  
Gross Reductions (13,263) 0  
Total net change in unrealized appreciation (depreciation) 3,475 (227)  
Fair value ending balance 11,517 8,042 8,269
Affiliate investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income   1,204  
Realized Gain (Loss) 0 1,758 (62,143)
Fair value beginning balance 0 9,458  
Gross Additions   0  
Gross Reductions   (13,547)  
Total net change in unrealized appreciation (depreciation) 0 4,089 63,806
Fair value ending balance   0 9,458
Investment Affiliated Issuers And Controlled Issuers      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income   5,893  
Realized Gain (Loss)   1,758  
Fair value beginning balance 76,458 82,962  
Gross Additions   3,232  
Gross Reductions   (13,547)  
Total net change in unrealized appreciation (depreciation)   3,811  
Fair value ending balance   76,458 82,962
Coronado Aesthetics, LLC | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Realized Gain (Loss) 0 0 0
Fair value beginning balance 319 565  
Total net change in unrealized appreciation (depreciation) (57) (246) 315
Fair value ending balance 262 319 565
Gibraltar Acquisition LLC | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Realized Gain (Loss) 0    
Total net change in unrealized appreciation (depreciation) 9,656    
Fair value ending balance 62,512    
Hercules Adviser LLC | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Realized Gain (Loss) 0 0 0
Fair value beginning balance 31,153 20,840  
Total net change in unrealized appreciation (depreciation) 9,560 7,163 11,955
Fair value ending balance 40,713 31,153 20,840
Tectura Corporation | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Realized Gain (Loss) 0 0 0
Fair value beginning balance 8,042 8,269  
Total net change in unrealized appreciation (depreciation) 3,475 (227) (331)
Fair value ending balance 11,517 8,042 8,269
Gibraltar Business Capital, LLC | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Realized Gain (Loss)   0 0
Fair value beginning balance 36,944 43,830  
Total net change in unrealized appreciation (depreciation)   (6,968) (14,616)
Fair value ending balance   36,944 43,830
Preferred Stock | Coronado Aesthetics, LLC | Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 313 500  
Gross Additions 0 0  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) (53) (187)  
Fair value ending balance 260 313 500
Preferred Stock | Tectura Corporation | Control investments | Other Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 0 0  
Gross Additions 13,263 0  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) (10,000) 0  
Fair value ending balance 3,263 0 0
Preferred Stock | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income   0  
Realized Gain (Loss)   0  
Fair value beginning balance 14,137 19,393  
Gross Additions   0  
Gross Reductions   0  
Total net change in unrealized appreciation (depreciation)   (5,256)  
Fair value ending balance   14,137 19,393
Preferred Stock | Black Crow AI, Inc. | Affiliate investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income   0  
Realized Gain (Loss)   3,772  
Fair value beginning balance 0 1,120  
Gross Additions   0  
Gross Reductions   (1,000)  
Total net change in unrealized appreciation (depreciation)   (120)  
Fair value ending balance   0 1,120
Common Stock | Coronado Aesthetics, LLC | Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 6 65  
Gross Additions 0 0  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) (4) (59)  
Fair value ending balance 2 6 65
Common Stock | Tectura Corporation | Control investments | Other Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 0 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) 4 0  
Fair value ending balance 4 0 0
Common Stock | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income   0  
Realized Gain (Loss)   0  
Fair value beginning balance 1,107 1,225  
Gross Additions   0  
Gross Reductions   0  
Total net change in unrealized appreciation (depreciation)   (118)  
Fair value ending balance   1,107 1,225
Common Stock | Pineapple Energy LLC | Affiliate investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income   0  
Realized Gain (Loss)   0  
Fair value beginning balance 0 591  
Gross Additions   0  
Gross Reductions   (4,767)  
Total net change in unrealized appreciation (depreciation)   4,176  
Fair value ending balance   0 591
Member Units | Gibraltar Acquisition LLC | Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0    
Realized Gain (Loss) 0    
Fair value beginning balance 15,244    
Gross Additions 6,000    
Gross Reductions 0    
Total net change in unrealized appreciation (depreciation) 6,790    
Fair value ending balance 28,034 15,244  
Member Units | Hercules Adviser LLC | Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 19,153 11,990  
Gross Additions 0 0  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) 9,560 7,163  
Fair value ending balance 28,713 19,153 11,990
Unsecured Debt | Gibraltar Acquisition LLC | Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 3,439    
Realized Gain (Loss) 0    
Fair value beginning balance 21,700    
Gross Additions 9,912    
Gross Reductions 0    
Total net change in unrealized appreciation (depreciation) 2,866    
Fair value ending balance 34,478 21,700  
Unsecured Debt | Hercules Adviser LLC | Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 608 546  
Realized Gain (Loss) 0 0  
Fair value beginning balance 12,000 8,850  
Gross Additions 0 3,150  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) 0 0  
Fair value ending balance 12,000 12,000 8,850
Unsecured Debt | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income   3,453  
Realized Gain (Loss)   0  
Fair value beginning balance 21,700 23,212  
Gross Additions   82  
Gross Reductions   0  
Total net change in unrealized appreciation (depreciation)   (1,594)  
Fair value ending balance   21,700 23,212
Senior Secured Debt | Tectura Corporation | Control investments | Other Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 690 690  
Realized Gain (Loss) 0 0  
Fair value beginning balance 8,042 8,269  
Gross Additions 0 0  
Gross Reductions (13,263) 0  
Total net change in unrealized appreciation (depreciation) 13,471 (227)  
Fair value ending balance 8,250 8,042 8,269
Senior Secured Debt | Pineapple Energy LLC | Affiliate investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income   1,204  
Realized Gain (Loss)   (2,014)  
Fair value beginning balance $ 0 7,747  
Gross Additions   0  
Gross Reductions   (7,780)  
Total net change in unrealized appreciation (depreciation)   33  
Fair value ending balance   $ 0 $ 7,747