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Schedule 12-14s - Summary of schedule of investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  | $ 116,231 |  | $ 72,115 |  | $ 221,321 |  | $ 137,272 |  |  |  |  |
Realized Gain (Loss) |  | 217 |  | (2,133) |  | 8,177 |  | (4,514) |  |  |  |  |
Investment cost |  | 3,114,097 |  |  |  | 3,114,097 |  |  |  | $ 3,005,696 |  |  |
Investment Owned, Fair Value |  | 3,112,789 |  |  |  | 3,112,789 |  |  |  | 2,963,955 |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  | 18,858 |  | (48,316) |  | 39,963 |  | (85,058) |  |  |  |  |
Coronado Aesthetics L L C [Member] | Preferred Stock [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [1],[2] |  |  |  |  | 0 |  |  |  |  |  |  |
Medical Devices And Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  | 1,052 |  |  |  | 1,052 |  |  |  | 1,834 |  |  |
Diversified Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  | 94,077 |  |  |  | 94,077 |  |  |  | 68,569 |  |  |
Consumer And Business Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  | 459,276 |  |  |  | 459,276 |  |  |  | 439,384 |  |  |
Sustainable And Renewable Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  | 11,333 |  |  |  | 11,333 |  |  |  | 15,486 |  |  |
Senior Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  | 2,878,923 |  |  |  | 2,878,923 |  |  |  | 2,741,388 |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  | 59,019 |  |  |  | 59,019 |  |  |  | 54,056 |  |  |
Investment, Affiliated Issuer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [3] |  |  |  |  |  |  | 3,415 |  |  |  |  |
Realized Gain (Loss) |  |  |  |  |  |  |  | 3,772 |  |  |  |  |
Investment Owned, Fair Value |  |  |  | 86,488 |  |  |  | 86,488 |  |  |  | $ 82,962 |
Gross Additions | [4] |  |  |  |  |  |  | 3,667 |  |  |  |  |
Gross reductions | [5] |  |  |  |  |  |  | 5,781 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  |  |  | 5,640 |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 2,209 | [2] | 2,292 | [3] |  |  |  |
Realized Gain (Loss) | [6] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Investment cost |  | 88,317 |  |  |  | 88,317 |  |  |  | 87,271 |  |  |
Investment Owned, Fair Value |  | 90,923 | [6],[7] | 82,875 | [6] | 90,923 | [6],[7] | 82,875 | [6] | 76,458 | [8] | 73,504 |
Gross Additions |  |  |  |  |  | 1,046 | [9] | 3,189 | [4] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [10] | 0 | [5] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [6] | 4,573 |  | 4,728 |  | 13,419 |  | 6,182 |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 1,867 | [2] | 1,950 | [3] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  |  |  | 0 |  |  |  |  |
Investment cost |  | 65,904 |  |  |  | 65,904 |  |  |  | 64,858 |  |  |
Investment Owned, Fair Value |  | 83,850 | [7] | 74,667 |  | 83,850 | [7] | 74,667 |  | 68,416 | [8] | 65,235 |
Gross Additions |  |  |  |  |  | 1,046 | [9] | 3,189 | [4] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [10] | 0 | [5] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 14,388 |  | 6,243 |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 342 | [2] | 342 | [3] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [9] | 0 |  |  |  |  |
Investment cost |  | 22,413 |  |  |  | 22,413 |  |  |  | 22,413 |  |  |
Investment Owned, Fair Value |  | 7,073 | [7] | 8,208 |  | 7,073 | [7] | 8,208 |  | 8,042 | [8] | 8,269 |
Gross Additions |  |  |  |  |  | 0 | [9] | 0 | [4] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [10] | 0 | [5] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | (969) |  | (61) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Hercules Adviser L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [6] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Investment Owned, Fair Value | [6] | 39,161 |  | 35,181 |  | 39,161 |  | 35,181 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [6] | 2,566 |  | 8,637 |  | 8,008 |  | 11,191 |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Hercules Adviser L L C [Member] | Member Units [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 0 | [2],[11] | 0 | [3],[12] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [9],[11] | 0 | [12] |  |  |  |
Investment Owned, Fair Value |  | 27,161 | [11] | 23,181 | [12] | 27,161 | [11] | 23,181 | [12] | 19,153 | [11] | 11,990 | [12]
Gross Additions |  |  |  |  |  | 0 | [9],[11] | 0 | [4],[12] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [10],[11] | 0 | [5],[12] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 8,008 | [11] | 11,191 | [12] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Coronado Aesthetics L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [6] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Investment Owned, Fair Value | [6] | 297 |  | 422 |  | 297 |  | 422 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [6] | (41) |  | (192) |  | (22) |  | (143) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Coronado Aesthetics L L C [Member] | Common Stock [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 0 | [2] | 0 | [3],[13] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [1],[9] | 0 | [13] |  |  |  |
Investment Owned, Fair Value |  | 5 | [1] | 10 | [13] | 5 | [1] | 10 | [13] | 6 | [1] | 65 | [13]
Gross Additions |  |  |  |  |  | 0 | [1],[9] | 0 | [4],[13] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [1],[10] | 0 | [5],[13] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | (1) | [1] | (55) | [13] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Coronado Aesthetics L L C [Member] | Preferred Stock [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [3],[13] |  |  |  |  |  |  | 0 |  |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [1] | 0 | [13] |  |  |  |
Investment Owned, Fair Value |  | 292 | [1] | 412 | [13] | 292 | [1] | 412 | [13] | 313 | [1] | 500 | [13]
Gross Additions |  |  |  |  |  | 0 | [1],[9] | 0 | [4],[13] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [1],[10] | 0 | [5],[13] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | (21) | [1] | (88) | [13] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Tectura Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [6] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Investment Owned, Fair Value | [6] | 7,073 |  | 8,208 |  | 7,073 |  | 8,208 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [6] | (701) |  | (139) |  | (969) |  | (61) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Tectura Corporation [Member] | Common Stock [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [2],[14] |  |  |  |  | 0 |  |  |  |  |  |  |
Investment Owned, Fair Value | [14] |  |  |  |  |  |  |  |  | 0 |  |  |
Gross Additions | [9],[14] |  |  |  |  | 0 |  |  |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [14] |  |  |  |  | 0 |  |  |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Tectura Corporation [Member] | Preferred Stock [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [2],[14] |  |  |  |  | 0 |  |  |  |  |  |  |
Investment Owned, Fair Value | [14] |  |  |  |  |  |  |  |  | 0 |  |  |
Gross Additions | [9],[14] |  |  |  |  | 0 |  |  |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [14] |  |  |  |  | 0 |  |  |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Gibraltar Business Capital L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [6] | 0 | [15] | 0 |  | 0 | [15] | 0 |  |  |  |  |
Investment Owned, Fair Value | [6] | 44,392 | [15] | 39,064 |  | 44,392 | [15] | 39,064 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [6] | 2,667 | [15] | (3,578) |  | 6,402 | [15] | (4,805) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Gibraltar Business Capital L L C [Member] | Common Stock [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [3],[16] |  |  |  |  |  |  | 0 |  |  |  |  |
Realized Gain (Loss) | [16] |  |  |  |  |  |  | 0 |  |  |  |  |
Investment Owned, Fair Value | [16] |  |  | 974 |  |  |  | 974 |  |  |  | 1,225 |
Gross Additions | [4],[16] |  |  |  |  |  |  | 0 |  |  |  |  |
Gross reductions | [5],[16] |  |  |  |  |  |  | 0 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [16] |  |  |  |  |  |  | (251) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Gibraltar Business Capital L L C [Member] | Preferred Stock [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [3],[16] |  |  |  |  |  |  | 0 |  |  |  |  |
Realized Gain (Loss) | [16] |  |  |  |  |  |  | 0 |  |  |  |  |
Investment Owned, Fair Value | [16] |  |  | 15,415 |  |  |  | 15,415 |  |  |  | 19,393 |
Gross Additions | [4],[16] |  |  |  |  |  |  | 0 |  |  |  |  |
Gross reductions | [5],[16] |  |  |  |  |  |  | 0 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [16] |  |  |  |  |  |  | (3,978) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Gibraltar Business Capital L L C [Member] | Member Units [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [2],[17] |  |  |  |  | 0 |  |  |  |  |  |  |
Investment Owned, Fair Value |  | 19,779 | [17] |  |  | 19,779 | [17] |  |  | 15,244 | [10] |  |
Gross Additions | [9],[17] |  |  |  |  | 1,000 |  |  |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [17] |  |  |  |  | 3,535 |  |  |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Medical Devices And Equipment [Member] | Coronado Aesthetics L L C [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | 250 |  |  |  | 250 |  |  |  | 250 |  |  |
Investment Owned, Fair Value |  | 297 | [7] |  |  | 297 | [7] |  |  | 319 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Medical Devices And Equipment [Member] | Coronado Aesthetics L L C [Member] | Preferred Series A | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 250 |  |  |  | $ 250 |  |  |  | $ 250 |  |  |
Shares |  | 5,000,000 |  |  |  | 5,000,000 |  |  |  | 5,000,000 |  |  |
Investment Owned, Fair Value |  | $ 292 | [7] |  |  | $ 292 | [7] |  |  | $ 313 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Medical Devices And Equipment [Member] | Coronado Aesthetics L L C [Member] | Common Stock [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 |  |  |
Shares |  | 180,000 |  |  |  | 180,000 |  |  |  | 180,000 |  |  |
Investment Owned, Fair Value |  | $ 5 | [7] |  |  | $ 5 | [7] |  |  | $ 6 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Diversified Financial Services [Member] | Hercules Adviser L L C [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | 12,035 |  |  |  | 12,035 |  |  |  | 12,035 |  |  |
Investment Owned, Fair Value |  | 39,161 | [7] |  |  | 39,161 | [7] |  |  | 31,153 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Diversified Financial Services [Member] | Hercules Adviser L L C [Member] | Member Units [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 35 |  |  |  | $ 35 |  |  |  | $ 35 |  |  |
Shares |  | 1 |  |  |  | 1 |  |  |  | 1,000 |  |  |
Investment Owned, Fair Value |  | $ 27,161 | [7] |  |  | $ 27,161 | [7] |  |  | $ 19,153 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Diversified Financial Services [Member] | Gibraltar Business Capital L L C [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | 53,619 |  |  |  | 53,619 |  |  |  | 52,573 |  |  |
Investment Owned, Fair Value |  | 44,392 | [7] |  |  | 44,392 | [7] |  |  | 36,944 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Diversified Financial Services [Member] | Gibraltar Business Capital L L C [Member] | Preferred Series A | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | $ 26,122 |  |  |
Shares |  |  |  |  |  |  |  |  |  | 10,602,752 |  |  |
Investment Owned, Fair Value | [8] |  |  |  |  |  |  |  |  | $ 14,137 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Diversified Financial Services [Member] | Gibraltar Business Capital L L C [Member] | Common Stock [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | $ 1,884 |  |  |
Shares |  |  |  |  |  |  |  |  |  | 830,000 |  |  |
Investment Owned, Fair Value | [8] |  |  |  |  |  |  |  |  | $ 1,107 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Diversified Financial Services [Member] | Gibraltar Business Capital L L C [Member] | Member Units [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 29,006 |  |  |  | $ 29,006 |  |  |  |  |  |  |
Shares |  | 1 |  |  |  | 1 |  |  |  |  |  |  |
Investment Owned, Fair Value | [7] | $ 19,779 |  |  |  | $ 19,779 |  |  |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer And Business Services [Member] | Tectura Corporation [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | 22,413 |  |  |  | 22,413 |  |  |  | 22,413 |  |  |
Investment Owned, Fair Value |  | 7,073 | [7] |  |  | 7,073 | [7] |  |  | 8,042 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer And Business Services [Member] | Tectura Corporation [Member] | Preferred Series BB | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 |  |  |
Shares |  | 1,000,000 |  |  |  | 1,000,000 |  |  |  | 1,000,000 |  |  |
Investment Owned, Fair Value |  | $ 0 | [7] |  |  | $ 0 | [7] |  |  | $ 0 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer And Business Services [Member] | Tectura Corporation [Member] | Common Stock [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 900 |  |  |  | $ 900 |  |  |  | $ 900 |  |  |
Shares |  | 414,994,863 |  |  |  | 414,994,863 |  |  |  | 414,994,863 |  |  |
Investment Owned, Fair Value |  | $ 0 | [7] |  |  | $ 0 | [7] |  |  | $ 0 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Senior Secured Debt [Member] | Tectura Corporation [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 342 | [2],[14] | 342 | [3],[18] |  |  |  |
Realized Gain (Loss) | [18] |  |  |  |  |  |  | 0 |  |  |  |  |
Investment Owned, Fair Value |  | $ 7,073 | [14] | 8,208 | [18] | 7,073 | [14] | 8,208 | [18] | $ 8,042 | [14] | 8,269 | [18]
Gross Additions |  |  |  |  |  | 0 | [9],[14] | 0 | [4],[18] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [10],[14] | 0 | [5],[18] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | $ (969) | [14] | (61) | [18] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Senior Secured Debt [Member] | Consumer And Business Services [Member] | Tectura Corporation [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Kind |  | 5.00% |  |  |  | 5.00% |  |  |  | 5.00% |  |  |
Investment cost |  | $ 13,263 |  |  |  | $ 13,263 |  |  |  | $ 240 |  |  |
Principal Amount |  | 23,703 |  |  |  | $ 23,703 |  |  |  | $ 10,680 |  |  |
Maturity Date |  |  |  |  |  | 2024-07 |  |  |  | 2024-07 |  |  |
Investment Owned, Fair Value |  | 0 | [7] |  |  | $ 0 | [7] |  |  | $ 0 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Unsecured Debt [Member] | Hercules Adviser L L C [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 302 | [2],[11] | 239 | [3],[12] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [9],[11] | 0 | [12] |  |  |  |
Investment Owned, Fair Value |  | 12,000 | [11] | 12,000 | [12] | 12,000 | [11] | 12,000 | [12] | 12,000 | [11] | 8,850 | [12]
Gross Additions | [4],[12] |  |  |  |  |  |  | 3,150 |  |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [10],[11] | 0 | [5],[12] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 0 | [9],[11] | 0 | [12] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Unsecured Debt [Member] | Gibraltar Business Capital L L C [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 1,565 | [2],[17] | 1,711 | [3],[16] |  |  |  |
Realized Gain (Loss) | [16] |  |  |  |  |  |  | 0 |  |  |  |  |
Investment Owned, Fair Value |  | $ 24,613 | [17] | 22,675 | [16] | 24,613 | [17] | 22,675 | [16] | $ 21,700 | [10] | 23,212 | [16]
Gross Additions |  |  |  |  |  | 46 | [9],[17] | 39 | [4],[16] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [10],[17] | 0 | [5],[16] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | $ 2,867 | [17] | (576) | [16] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Unsecured Debt [Member] | Diversified Financial Services [Member] | Hercules Adviser L L C [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Cash |  | 5.00% |  |  |  | 5.00% |  |  |  | 5.00% |  |  |
Investment cost |  | $ 12,000 |  |  |  | $ 12,000 |  |  |  | $ 12,000 |  |  |
Principal Amount |  | 12,000 |  |  |  | $ 12,000 |  |  |  | $ 12,000 |  |  |
Maturity Date |  |  |  |  |  | 2025-06 |  |  |  | 2023-05 |  |  |
Investment Owned, Fair Value |  | $ 12,000 | [7] |  |  | $ 12,000 | [7] |  |  | $ 12,000 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Unsecured Debt [Member] | Diversified Financial Services [Member] | Gibraltar Business Capital L L C [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Cash |  | 11.50% |  |  |  | 11.50% |  |  |  | 14.50% |  |  |
Investment cost |  | $ 24,613 |  |  |  | $ 24,613 |  |  |  | $ 14,715 |  |  |
Principal Amount |  | 25,000 |  |  |  | 25,000 |  |  |  | $ 15,000 |  |  |
Maturity Date |  |  |  |  |  |  |  |  |  | 2026-09 |  |  |
Investment Owned, Fair Value |  | $ 24,613 | [7] |  |  | $ 24,613 | [7] |  |  | $ 12,802 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Unsecured Debt One [Member] | Diversified Financial Services [Member] | Gibraltar Business Capital L L C [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Cash |  |  |  |  |  |  |  |  |  | 11.50% |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | $ 9,852 |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |
Maturity Date |  |  |  |  |  | 2026-09 |  |  |  | 2026-09 |  |  |
Investment Owned, Fair Value | [8] |  |  |  |  |  |  |  |  | $ 8,898 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Senior Secured Debt One [Member] | Consumer And Business Services [Member] | Tectura Corporation [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Cash |  | 8.25% |  |  |  | 8.25% |  |  |  | 8.25% |  |  |
Investment cost |  | $ 8,250 |  |  |  | $ 8,250 |  |  |  | $ 8,250 |  |  |
Principal Amount |  | 8,250 |  |  |  | $ 8,250 |  |  |  | $ 8,250 |  |  |
Maturity Date |  |  |  |  |  | 2024-07 |  |  |  | 2024-07 |  |  |
Investment Owned, Fair Value |  | 7,073 | [7] |  |  | $ 7,073 | [7] |  |  | $ 8,042 | [8] |  |
Investment, Affiliated Issuer, Controlled [Member] | Senior Secured Debt Two [Member] | Consumer And Business Services [Member] | Tectura Corporation [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Kind |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | $ 13,023 |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  | $ 13,023 |  |  |
Maturity Date |  |  |  |  |  |  |  |  |  | 2024-07 |  |  |
Investment Owned, Fair Value | [8] |  |  |  |  |  |  |  |  | $ 0 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [3] |  |  |  |  |  |  | 1,123 |  |  |  |  |
Realized Gain (Loss) |  | 0 |  | 0 |  | 0 |  | 3,772 |  |  |  |  |
Investment Owned, Fair Value |  |  |  | 3,613 |  |  |  | 3,613 |  |  |  | 9,458 |
Gross Additions | [4] |  |  |  |  |  |  | 478 |  |  |  |  |
Gross reductions | [5] |  |  |  |  |  |  | 5,781 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  | $ 0 |  | (1,295) |  | 0 |  | (542) |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Pineapple Energy L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [6],[19] |  |  | 0 |  |  |  | 0 |  |  |  |  |
Investment Owned, Fair Value | [6],[19] |  |  | 3,613 |  |  |  | 3,613 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [6],[19] |  |  | (1,295) |  |  |  | (422) |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Pineapple Energy L L C [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [3],[20] |  |  |  |  |  |  | 0 |  |  |  |  |
Realized Gain (Loss) | [20] |  |  |  |  |  |  | 0 |  |  |  |  |
Investment Owned, Fair Value | [20] |  |  | 673 |  |  |  | 673 |  |  |  | 591 |
Gross Additions | [4],[20] |  |  |  |  |  |  | 400 |  |  |  |  |
Gross reductions | [5],[20] |  |  |  |  |  |  | 0 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [20] |  |  |  |  |  |  | (318) |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Black Crow A I Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [6],[19] |  |  | 0 |  |  |  | 3,772 |  |  |  |  |
Investment Owned, Fair Value | [6],[19] |  |  | 0 |  |  |  | 0 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [6],[19] |  |  | 0 |  |  |  | (120) |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Black Crow A I Inc [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [3],[21] |  |  |  |  |  |  | 0 |  |  |  |  |
Realized Gain (Loss) | [21] |  |  |  |  |  |  | 3,772 |  |  |  |  |
Investment Owned, Fair Value | [21] |  |  | 0 |  |  |  | 0 |  |  |  | 1,120 |
Gross Additions | [4],[21] |  |  |  |  |  |  | 0 |  |  |  |  |
Gross reductions | [5],[21] |  |  |  |  |  |  | (1,000) |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [21] |  |  |  |  |  |  | (120) |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Senior Secured Debt [Member] | Pineapple Energy L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [3],[20] |  |  |  |  |  |  | 1,123 |  |  |  |  |
Realized Gain (Loss) | [20] |  |  |  |  |  |  | 0 |  |  |  |  |
Investment Owned, Fair Value | [20] |  |  | $ 2,940 |  |  |  | 2,940 |  |  |  | $ 7,747 |
Gross Additions | [4],[20] |  |  |  |  |  |  | 78 |  |  |  |  |
Gross reductions | [5],[20] |  |  |  |  |  |  | (4,781) |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [20] |  |  |  |  |  |  | $ (104) |  |  |  |  |
Investment, Affiliated Issuers Controlled, Not Majority-Owned [Member] | Senior Secured Debt [Member] | Tectura Corporation [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [9],[14] |  |  |  |  | $ 0 |  |  |  |  |  |  |
[1] | As of December 31, 2021, the Company's investment in Coronado Aesthetics, LLC became classified as a control investment as a result of obtaining more than 25% of the voting securities of the portfolio company.
[2] | Represents the total amount of interest, fees, or dividends credited to income for the period an investment was an affiliate or control investment.
[3] | Represents the total amount of interest, fees, or dividends credited to income for the period an investment was an affiliate or control investment.
[4] | Gross additions include increases in the cost basis of investments resulting from new portfolio investments, paid-in-kind interest or dividends, the amortization of discounts and closing fees and the exchange of one or more existing securities for one or more new securities.
[5] | Gross reductions include decreases in the cost basis of investments resulting from principal repayments or sales and the exchange of one or more existing securities for one or more new securities. Gross reductions also include previously recognized depreciation on investments that become control or affiliate investments during the period.
[6] | In accordance with Rules 3-09, 4-08(g), and Rule 10-01(b)(1) of Regulation S-X, (“Rule 3-09”, “Rule 4-08(g)”, and “Rule 10-01(b)(1)”, respectively), the Company must determine if its unconsolidated subsidiaries are considered “significant subsidiaries”. As of June 30, 2023, there were no unconsolidated subsidiaries that are considered “significant subsidiaries”. As of June 30, 2022, the Hercules Adviser, LLC qualified as a significant subsidiary pursuant to Rule 10-01(b)(1). The total revenue, operating income, and net income were $3.5 million, $(1.9) million, and $(1.8) million for the six months ended June 30, 2022.
[7] | All of the Company’s control and affiliate investments are Level 3 investments valued using significant unobservable inputs.
[8] | All of the Company’s control and affiliate investments are Level 3 investments valued using significant unobservable inputs.
[9] | Gross additions include increases in the cost basis of investments resulting from new portfolio investments, paid-in-kind interest or dividends, the amortization of discounts and closing fees and the exchange of one or more existing securities for one or more new securities.
[10] | Gross reductions include decreases in the cost basis of investments resulting from principal repayments or sales and the exchange of one or more existing securities for one or more new securities. Gross reductions also include previously recognized depreciation on investments that become control or affiliate investments during the period.
[11] | Hercules Adviser LLC is a wholly owned subsidiary providing investment management and other services to the Adviser Funds and other External Parties.
[12] | Hercules Adviser LLC is a wholly-owned subsidiary providing investment management and other services to External Parties.
[13] | As of December 31, 2021, the Company's investment in Coronado Aesthetics, LLC became classified as a control investment as a result of obtaining more than 25% of the voting securities of the portfolio company.
[14] | As of March 31, 2017, the Company's investment in Tectura Corporation became classified as a control investment as of result of obtaining more than 50% representation on the portfolio company's board. In May 2018, the Company purchased common shares, thereby obtaining greater than 25% of voting securities of Tectura as of June 30, 2018.
[15] | Gibraltar Acquisition LLC is a wholly-owned subsidiary, which is the holding company for their wholly-owned affiliated portfolio companies, Gibraltar Business Capital, LLC and Gibraltar Equipment Finance, LLC. The subsidiary has no significant assets or liabilities, other than their equity and debt investments and equity interest in Gibraltar Business Capital, LLC and Gibraltar Equipment Finance, LLC, respectively.
[16] | As of March 31, 2018, the Company's investment in Gibraltar Business Capital, LLC became classified as a control investment as a result of obtaining a controlling financial interest.
[17] | As of March 31, 2018, the Company's investment in Gibraltar Acquisition LLC (p.k.a. Gibraltar Business Capital, LLC) became classified as a control investment as a result of obtaining a controlling financial interest. Gibraltar Acquisition LLC is a wholly-owned subsidiary, which is the holding company for their wholly-owned affiliated portfolio companies, Gibraltar Business Capital, LLC and Gibraltar Equipment Finance, LLC. The subsidiary has no significant assets or liabilities, other than their equity and debt investments and equity interest in Gibraltar Business Capital, LLC and Gibraltar Equipment Finance, LLC, respectively.
[18] | As of March 31, 2017, the Company's investment in Tectura Corporation became classified as a control investment as of result of obtaining more than 50% representation on the portfolio company's board. In May 2018, the Company purchased common shares, thereby obtaining greater than 25% of voting securities of Tectura as of June 30, 2018.
[19] | As of September 30, 2022, Black Crow AI, Inc. and Pineapple Energy LLC were no longer affiliates as defined under the 1940 Act.
[20] | As of December 11, 2020, the Company's investment in Pineapple Energy LLC became classified as an affiliate investment as a result of obtaining more than 5% but less than 25% of the voting securities of the portfolio company.
[21] | During the six months ended June 30, 2022, the Company sold its investments in Black Crow AI, Inc., as a result it is no longer an affiliate investment.

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