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Schedule 12-14s - CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES (Parenthetical) (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment cost | $ 3,247,033,000 | $ 3,005,696,000 |
Investments, at fair value: | $ 3,248,046,000 | $ 2,963,955,000 |
Control investments |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment owned, percent of net assets | 6.38% | 5.46% |
Investment cost | $ 103,182,000 | $ 87,271,000 |
Investments, at fair value: | $ 115,004,000 | $ 76,458,000 | $ 73,504,000
Control investments | Majority Owned Control Investments |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment owned, percent of net assets | 5.74% | 4.88% |
Investment cost | $ 80,769,000 | $ 64,858,000 |
Investments, at fair value: | $ 103,487,000 | $ 68,416,000 | 65,235,000
Control investments | Other Control Investments |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment owned, percent of net assets | 0.64% | 0.58% |
Investment cost | $ 22,413,000 | $ 22,413,000 |
Investments, at fair value: | 11,517,000 | 8,042,000 | 8,269,000
Control investments | Coronado Aesthetics, LLC |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 262,000 | 319,000 | 565,000
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Preferred Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 260,000 | 313,000 | 500,000
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Common Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 2,000 | 6,000 | 65,000
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | Majority Owned Control Investments |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment cost | 250,000 | 250,000 |
Investments, at fair value: | $ 262,000 | $ 319,000 |
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | Majority Owned Control Investments | Common Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Shares | 180,000 | 180,000 |
Investment cost | $ 0 | $ 0 |
Investments, at fair value: | $ 2,000 | $ 6,000 |
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 | 5,000,000 | 5,000,000 |
Investment cost | $ 250,000 | $ 250,000 |
Investments, at fair value: | 260,000 | 313,000 |
Control investments | Gibraltar Acquisition LLC |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 62,512,000 |  |
Control investments | Gibraltar Acquisition LLC | Majority Owned Control Investments | Unsecured Debt |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 34,478,000 | 21,700,000 |
Control investments | Gibraltar Acquisition LLC | Majority Owned Control Investments | Member Units |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 28,034,000 | 15,244,000 |
Control investments | Gibraltar Acquisition LLC | Diversified Financial Services | Majority Owned Control Investments |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment cost | 68,484,000 |  |
Investments, at fair value: | $ 62,512,000 |  |
Control investments | Gibraltar Acquisition LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt One |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Maturity Date | 2026-09 |  |
Interest rate and floor, fixed | 11.50% |  |
Principal amount | $ 25,000,000 |  |
Investment cost | 24,663,000 |  |
Investments, at fair value: | $ 24,663,000 |  |
Control investments | Gibraltar Acquisition LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt Two |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Maturity Date | 2026-09 |  |
Interest rate and floor, fixed | 11.95% |  |
Principal amount | $ 10,000,000 |  |
Investment cost | 9,815,000 |  |
Investments, at fair value: | $ 9,815,000 |  |
Control investments | Gibraltar Acquisition LLC | Diversified Financial Services | Majority Owned Control Investments | Member Units |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Shares | 1 |  |
Investment cost | $ 34,006,000 |  |
Investments, at fair value: | 28,034,000 |  |
Control investments | Hercules Adviser LLC |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 40,713,000 | 31,153,000 | 20,840,000
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Unsecured Debt |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 12,000,000 | 12,000,000 | 8,850,000
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Member Units |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 28,713,000 | 19,153,000 | 11,990,000
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment cost | 12,035,000 | 12,035,000 |
Investments, at fair value: | $ 40,713,000 | $ 31,153,000 |
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 | $ 12,000,000 | $ 12,000,000 |
Investment cost | 12,000,000 | 12,000,000 |
Investments, at fair value: | $ 12,000,000 | $ 12,000,000 |
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments | Member Units |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Shares | 1 | 1 |
Investment cost | $ 35,000 | $ 35,000 |
Investments, at fair value: | 28,713,000 | 19,153,000 |
Control investments | Tectura Corporation |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 11,517,000 | 8,042,000 | 8,269,000
Control investments | Tectura Corporation | Other Control Investments | Senior Secured Debt |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 8,250,000 | 8,042,000 | 8,269,000
Control investments | Tectura Corporation | Other Control Investments | Preferred Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 3,263,000 | 0 | 0
Control investments | Tectura Corporation | Other Control Investments | Common Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: | 4,000 | 0 | 0
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment cost | 22,413,000 | 22,413,000 |
Investments, at fair value: | $ 11,517,000 | $ 8,042,000 |
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% |  |
Interest rate paid in kind |  | 5.00% |
Principal amount | $ 8,250,000 | $ 10,680,000 |
Investment cost | 8,250,000 | 240,000 |
Investments, at fair value: | 8,250,000 | $ 0 |
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments | Senior Secured Debt One |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Maturity Date |  | 2024-07 |
Interest rate and floor, fixed |  | 8.25% |
Principal amount |  | $ 8,250,000 |
Investment cost |  | 8,250,000 |
Investments, at fair value: |  | $ 8,042,000 |
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments | Senior Secured Debt Two |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Maturity Date |  | 2024-07 |
Interest rate paid in kind |  | 5.00% |
Principal amount |  | $ 13,023,000 |
Investment cost |  | 13,023,000 |
Investments, at fair value: |  | $ 0 |
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments | Common Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Shares |  | 414,994,863 |
Principal amount | 414,994,863 |  |
Investment cost | 900,000 | $ 900,000 |
Investments, at fair value: | 4,000 | $ 0 |
Control investments | Tectura Corporation | Consumer & Business Services | Preferred Series BB | Other Control Investments | Preferred Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Shares |  | 1,000,000 |
Principal amount | 1,000,000 |  |
Investment cost | 0 | $ 0 |
Investments, at fair value: | $ 12,000 | 0 |
Control investments | Tectura Corporation | Consumer & Business Services | Preferred Series C | Other Control Investments | Preferred Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Shares | 3,235,298 |  |
Investment cost | $ 13,263,000 |  |
Investments, at fair value: | $ 3,251,000 |  |
Control investments | Gibraltar Business Capital, LLC |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: |  | 36,944,000 | 43,830,000
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Unsecured Debt |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: |  | 21,700,000 | 23,212,000
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Preferred Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: |  | 14,137,000 | 19,393,000
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Common Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investments, at fair value: |  | 1,107,000 | $ 1,225,000
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment cost |  | 52,573,000 |
Investments, at fair value: |  | $ 36,944,000 |
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 |
Interest rate and floor, fixed |  | 14.50% |
Principal amount |  | $ 15,000,000 |
Investment cost |  | 14,715,000 |
Investments, at fair value: |  | $ 12,802,000 |
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 |
Interest rate and floor, fixed |  | 11.50% |
Principal amount |  | $ 10,000,000 |
Investment cost |  | 9,852,000 |
Investments, at fair value: |  | $ 8,898,000 |
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments | Common Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Shares |  | 830,000 |
Investment cost |  | $ 1,884,000 |
Investments, at fair value: |  | $ 1,107,000 |
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Preferred Series A | Majority Owned Control Investments | Preferred Stock |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Shares |  | 10,602,752 |
Investment cost |  | $ 26,122,000 |
Investments, at fair value: |  | $ 14,137,000 |

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