Quarterly report [Sections 13 or 15(d)]

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

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CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Schedule of Investment Gain/(Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income $ 141,536 $ 119,511
Investments, fair value, beginning balance 4,466,647  
Net Change in Unrealized Appreciation (Depreciation) (45,005) (25,565)
Investments, fair value, ending balance 4,721,987  
Control investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 3,434 3,676
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 115,051 113,179
Gross Additions 3,036 12,578
Gross Reductions (300) (12,000)
Net Change in Unrealized Appreciation (Depreciation) (1,539) 1,977
Investments, fair value, ending balance 116,248 115,734
Control investments | Majority Owned Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 3,264 3,506
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 105,710 101,522
Gross Additions 3,036 12,578
Gross Reductions (300) (12,000)
Net Change in Unrealized Appreciation (Depreciation) (1,984) 1,864
Investments, fair value, ending balance 106,462 103,964
Control investments | Other Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 170 170
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 9,341 11,657
Gross Additions 0 0
Gross Reductions 0 0
Net Change in Unrealized Appreciation (Depreciation) 445 113
Investments, fair value, ending balance 9,786 11,770
Coronado Aesthetics, LLC | Control investments    
Investments in and Advances to Affiliates [Line Items]    
Realized Gain (Loss) 0 0
Net Change in Unrealized Appreciation (Depreciation) (60) (22)
Investments, fair value, ending balance 158 47
Gibraltar Business Capital, LLC | Control investments    
Investments in and Advances to Affiliates [Line Items]    
Realized Gain (Loss) 0 0
Net Change in Unrealized Appreciation (Depreciation) 213 (941)
Investments, fair value, ending balance 62,167 58,900
Hercules Adviser LLC | Control investments    
Investments in and Advances to Affiliates [Line Items]    
Realized Gain (Loss) 0 0
Net Change in Unrealized Appreciation (Depreciation) (2,137) 2,827
Investments, fair value, ending balance 44,137 45,017
Tectura Corporation | Control investments    
Investments in and Advances to Affiliates [Line Items]    
Realized Gain (Loss) 0 0
Net Change in Unrealized Appreciation (Depreciation) 445 113
Investments, fair value, ending balance 9,786 11,770
Preferred Stock | Coronado Aesthetics, LLC | Control investments | Majority Owned Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 0 0
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 218 69
Gross Additions 0 0
Gross Reductions 0 0
Net Change in Unrealized Appreciation (Depreciation) (60) (22)
Investments, fair value, ending balance 158 47
Preferred Stock | Tectura Corporation | Control investments | Other Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 0 0
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 1,250 3,623
Gross Additions 0 0
Gross Reductions 0 0
Net Change in Unrealized Appreciation (Depreciation) 453 113
Investments, fair value, ending balance 1,703 3,736
Common Stock | Coronado Aesthetics, LLC | Control investments | Majority Owned Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 0 0
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 0 0
Gross Additions 0 0
Gross Reductions 0 0
Net Change in Unrealized Appreciation (Depreciation) 0 0
Investments, fair value, ending balance 0 0
Common Stock | Tectura Corporation | Control investments | Other Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 0 0
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 0 7
Gross Additions 0 0
Gross Reductions 0 0
Net Change in Unrealized Appreciation (Depreciation) 0 (5)
Investments, fair value, ending balance 0 2
Unsecured Debt | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 1,163 1,606
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 38,255 36,212
Gross Additions 36 578
Gross Reductions 0 0
Net Change in Unrealized Appreciation (Depreciation) 0 0
Investments, fair value, ending balance 38,291 36,790
Unsecured Debt | Hercules Adviser LLC | Control investments | Majority Owned Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 2,101 1,900
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 0 12,000
Gross Additions 3,000 0
Gross Reductions 0 (12,000)
Net Change in Unrealized Appreciation (Depreciation) 0 0
Investments, fair value, ending balance 3,000 0
Member Units | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 0 0
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 23,963 23,051
Gross Additions 0 0
Gross Reductions (300) 0
Net Change in Unrealized Appreciation (Depreciation) 213 (941)
Investments, fair value, ending balance 23,876 22,110
Member Units | Hercules Adviser LLC | Control investments | Majority Owned Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 0 0
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 43,274 30,190
Gross Additions 0 12,000
Gross Reductions 0 0
Net Change in Unrealized Appreciation (Depreciation) (2,137) 2,827
Investments, fair value, ending balance 41,137 45,017
Senior Secured Debt | Tectura Corporation | Control investments | Other Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Amount of Interest, Dividends, and Fees Credited to Income 170 170
Realized Gain (Loss) 0 0
Investments, fair value, beginning balance 8,091 8,027
Gross Additions 0 0
Gross Reductions 0 0
Net Change in Unrealized Appreciation (Depreciation) (8) 5
Investments, fair value, ending balance $ 8,083 $ 8,032