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Schedule 12-14s - Summary of schedule of investment (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  | $ 84,229,000 |  | $ 70,193,000 |  | $ 221,501,000 |  | $ 208,511,000 |  |  |  |  |
Realized Gain (Loss) |  | 5,289,000 |  | 21,111,000 |  | 775,000 |  | 14,599,000 |  |  |  |  |
Investment cost |  | 2,869,469,000 |  |  |  | 2,869,469,000 |  |  |  | $ 2,390,984,000 |  |  |
Investment Owned At Fair Value |  | 2,825,738,000 |  |  |  | 2,825,738,000 |  |  |  | 2,434,522,000 |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  | (2,089,000) |  | (35,651,000) |  | (87,147,000) |  | 46,231,000 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned At Fair Value |  | 93,096,000 |  |  |  | 93,096,000 |  |  |  | 115,271,000 |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned At Fair Value |  | 54,393,000 |  |  |  | 54,393,000 |  |  |  | 52,890,000 |  |  |
Senior Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned At Fair Value |  | 2,607,006,000 |  |  |  | 2,607,006,000 |  |  |  | 2,156,709,000 |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned At Fair Value |  | 41,038,000 |  |  |  | 41,038,000 |  |  |  | 69,439,000 |  |  |
Sustainable And Renewable Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned At Fair Value |  | 15,683,000 |  |  |  | 15,683,000 |  |  |  | 39,387,000 |  |  |
Medical Devices And Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned At Fair Value |  | 17,421,000 |  |  |  | 17,421,000 |  |  |  | 12,612,000 |  |  |
Diversified Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned At Fair Value |  | 72,061,000 |  |  |  | 72,061,000 |  |  |  | 65,073,000 |  |  |
Internet Consumer And Business Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned At Fair Value |  | 489,968,000 |  |  |  | 489,968,000 |  |  |  | 395,506,000 |  |  |
Investment, Affiliated Issuer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 4,694,000 | [1] | 2,946,000 | [2] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 1,758,000 |  | (62,143,000) |  |  |  |  |
Investment cost |  | 87,249,000 |  |  |  | 87,249,000 |  |  |  | 97,586,000 |  |  |
Investment Owned At Fair Value |  | 80,325,000 | [3] | 75,547,000 |  | 80,325,000 | [3] | 75,547,000 |  | 82,962,000 | [4] | $ 65,740,000 |
Gross Additions |  |  |  |  |  | 3,210,000 | [5] | 19,090,000 | [6] |  |  |  |
Gross reductions |  |  |  |  |  | (13,547,000) | [7] | 66,176,000 | [8] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 7,700,000 |  | 56,893,000 |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 3,490,000 | [1] | 2,943,000 | [2] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 |  | 0 |  |  |  |  |
Investment cost |  | 87,249,000 |  |  |  | 87,249,000 |  |  |  | 84,039,000 |  |  |
Investment Owned At Fair Value |  | 80,325,000 | [3] | 65,835,000 |  | 80,325,000 | [3] | 65,835,000 |  | $ 73,504,000 | [4] | 57,400,000 |
Gross Additions |  |  |  |  |  | 3,210,000 | [5] | 15,762,000 | [6] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7] | 0 | [8] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  | (2,571,000) |  | (3,774,000) |  | 3,611,000 |  | (7,327,000) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Hercules Adviser L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [9] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Investment Owned At Fair Value | [9] | 33,945,000 |  | 16,804,000 |  | 33,945,000 |  | 16,804,000 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [9] | (1,236,000) |  | (219,000) |  | 9,955,000 |  | 10,669,000 |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Coronado Aesthetics L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [9] | 0 |  |  |  | 0 |  |  |  |  |  |  |
Investment Owned At Fair Value | [9] | 400,000 |  |  |  | 400,000 |  |  |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [9] | (22,000) |  |  |  | (165,000) |  |  |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Tectura Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [9] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Investment Owned At Fair Value | [9] | 8,318,000 |  | 8,294,000 |  | 8,318,000 |  | 8,294,000 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [9] | 110,000 |  | (80,000) |  | 49,000 |  | (306,000) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Gibraltar Business Capital L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [9] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Investment Owned At Fair Value | [9] | 37,662,000 |  | 40,737,000 |  | 37,662,000 |  | 40,737,000 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [9] | (1,423,000) |  | (3,475,000) |  | (6,228,000) |  | (17,690,000) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Sustainable And Renewable Technology [Member] | Pineapple Energy L L C [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Sustainable And Renewable Technology [Member] | Pineapple Energy L L C [Member] | Senior Secured Tranche A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Kind |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Maturity Date |  |  |  |  |  |  |  |  |  | 2023-12 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Sustainable And Renewable Technology [Member] | Pineapple Energy L L C [Member] | Senior Secured Tranche B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Cash |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  | $ 280,000 |  |  |
Maturity Date |  |  |  |  |  |  |  |  |  | 2022-01 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 2,974,000 | [1] | 2,422,000 | [2] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 |  | 0 |  |  |  |  |
Investment cost |  | 64,836,000 |  |  |  | 64,836,000 |  |  |  | $ 61,626,000 |  |  |
Investment Owned At Fair Value |  | 72,007,000 | [3] | 57,541,000 |  | 72,007,000 | [3] | 57,541,000 |  | 65,235,000 | [4] | 48,800,000 |
Gross Additions |  |  |  |  |  | 3,210,000 | [5] | 15,762,000 | [6] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7] | 0 | [8] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 3,562,000 |  | (7,021,000) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Hercules Adviser L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | 12,035,000 |  |  |  | 12,035,000 |  |  |  | 8,885,000 |  |  |
Investment Owned At Fair Value |  | $ 33,945,000 | [3] |  |  | $ 33,945,000 | [3] |  |  | 20,840,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Hercules Adviser L L C [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Cash |  | 5.00% |  |  |  | 5.00% |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | $ 393,000 | [1],[10] | 59,000 | [2],[11] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [10] | 0 | [11] |  |  |  |
Investment cost |  | $ 12,000,000 |  |  |  | 12,000,000 |  |  |  |  |  |  |
Principal Amount |  | 12,000,000 |  |  |  | $ 12,000,000 |  |  |  |  |  |  |
Maturity Date |  |  |  |  |  | 2025-06 |  |  |  |  |  |  |
Investment Owned At Fair Value |  | 12,000,000 | [3],[10] | 6,100,000 | [11] | $ 12,000,000 | [3],[10] | 6,100,000 | [11] | 8,850,000 | [10] | 0 | [11]
Gross Additions |  |  |  |  |  | 3,150,000 | [5],[10] | 6,100,000 | [6],[11] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7],[10] | 0 | [8],[11] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 0 | [10] | 0 | [11] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Hercules Adviser L L C [Member] | Member Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 0 | [1],[10] | 0 | [2],[11] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [10] | 0 | [11] |  |  |  |
Investment cost |  | $ 35,000 |  |  |  | $ 35,000 |  |  |  |  |  |  |
Shares |  | 1 |  |  |  | 1 |  |  |  |  |  |  |
Investment Owned At Fair Value |  | $ 21,945,000 | [3],[10] | 10,704,000 | [11] | $ 21,945,000 | [3],[10] | 10,704,000 | [11] | 11,990,000 | [10] | 0 | [11]
Gross Additions |  |  |  |  |  | 0 | [5],[10] | 35,000 | [6],[11] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7],[10] | 0 | [8],[11] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 9,955,000 | [10] | 10,669,000 | [11] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Coronado Aesthetics L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | 250,000 |  |  |  | 250,000 |  |  |  | 250,000 |  |  |
Investment Owned At Fair Value |  | 400,000 | [3] |  |  | 400,000 | [3] |  |  | 565,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Coronado Aesthetics L L C [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [1],[12] |  |  |  |  | 0 |  |  |  |  |  |  |
Realized Gain (Loss) | [12] |  |  |  |  | 0 |  |  |  |  |  |  |
Investment Owned At Fair Value | [12] | 9,000 |  |  |  | 9,000 |  |  |  | 65,000 |  |  |
Gross Additions | [5],[12] |  |  |  |  | 0 |  |  |  |  |  |  |
Gross reductions | [7],[12] |  |  |  |  | 0 |  |  |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [12] |  |  |  |  | (56,000) |  |  |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Coronado Aesthetics L L C [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [1],[12] |  |  |  |  | 0 |  |  |  |  |  |  |
Realized Gain (Loss) | [12] |  |  |  |  | 0 |  |  |  |  |  |  |
Investment Owned At Fair Value | [12] | 391,000 |  |  |  | 391,000 |  |  |  | 500,000 |  |  |
Gross Additions | [5],[12] |  |  |  |  | 0 |  |  |  |  |  |  |
Gross reductions | [7],[12] |  |  |  |  | 0 |  |  |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [12] |  |  |  |  | (109,000) |  |  |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Gibraltar Business Capital L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | 52,551,000 |  |  |  | 52,551,000 |  |  |  | 52,491,000 |  |  |
Investment Owned At Fair Value |  | 37,662,000 | [3] |  |  | 37,662,000 | [3] |  |  | 43,830,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Gibraltar Business Capital L L C [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 0 | [1],[13] | 0 | [2],[14] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [13] | 0 | [14] |  |  |  |
Investment Owned At Fair Value |  | 1,134,000 | [13] | 1,166,000 | [14] | 1,134,000 | [13] | 1,166,000 | [14] | 1,225,000 | [13] | 2,276,000 | [14]
Gross Additions |  |  |  |  |  | 0 | [5],[13] | 0 | [6],[14] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7],[13] | 0 | [8],[14] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | (91,000) | [13] | (1,110,000) | [14] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Gibraltar Business Capital L L C [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 2,581,000 | [1],[13] | 2,363,000 | [2],[14] |  |  |  |
Realized Gain (Loss) | [14] |  |  |  |  |  |  | 0 |  |  |  |  |
Investment Owned At Fair Value |  | 22,039,000 | [13] | 23,403,000 | [14] | 22,039,000 | [13] | 23,403,000 | [14] | 23,212,000 | [13] | 14,970,000 | [14]
Gross Additions |  |  |  |  |  | 60,000 | [5],[13] | 9,627,000 | [6],[14] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7],[13] | 0 | [8],[14] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | (1,233,000) | [13] | (1,194,000) | [14] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Gibraltar Business Capital L L C [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 0 | [1],[13] | 0 | [2],[14] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [13] | 0 | [14] |  |  |  |
Investment Owned At Fair Value |  | 14,489,000 | [13] | 16,168,000 | [14] | 14,489,000 | [13] | 16,168,000 | [14] | 19,393,000 | [13] | 31,554,000 | [14]
Gross Additions |  |  |  |  |  | 0 | [5],[13] | 0 | [6],[14] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7],[13] | 0 | [8],[14] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | (4,904,000) | [13] | (15,386,000) | [14] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Medical Devices And Equipment [Member] | Coronado Aesthetics L L C [Member] | Preferred Series A |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 250,000 |  |  |  | $ 250,000 |  |  |  | $ 250,000 |  |  |
Shares |  | 5,000,000 |  |  |  | 5,000,000 |  |  |  | 5,000,000 |  |  |
Investment Owned At Fair Value |  | $ 391,000 | [3] |  |  | $ 391,000 | [3] |  |  | $ 500,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Medical Devices And Equipment [Member] | Coronado Aesthetics L L C [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 |  |  |
Shares |  | 180,000 |  |  |  | 180,000 |  |  |  | 180,000 |  |  |
Investment Owned At Fair Value |  | $ 9,000 | [3] |  |  | $ 9,000 | [3] |  |  | $ 65,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Diversified Financial Services [Member] | Hercules Adviser L L C [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Cash |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | $ 8,850,000 |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  | $ 8,850,000 |  |  |
Maturity Date |  |  |  |  |  |  |  |  |  | 2023-05 |  |  |
Investment Owned At Fair Value | [4] |  |  |  |  |  |  |  |  | $ 8,850,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Diversified Financial Services [Member] | Hercules Adviser L L C [Member] | Member Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | $ 35,000 |  |  |
Shares |  |  |  |  |  |  |  |  |  | 1,000 |  |  |
Investment Owned At Fair Value | [4] |  |  |  |  |  |  |  |  | $ 11,990,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Diversified Financial Services [Member] | Gibraltar Business Capital L L C [Member] | Preferred Series A |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 26,122,000 |  |  |  | $ 26,122,000 |  |  |  | $ 26,122,000 |  |  |
Shares |  | 10,602,752 |  |  |  | 10,602,752 |  |  |  | 10,602,752 |  |  |
Investment Owned At Fair Value |  | $ 14,489,000 | [3] |  |  | $ 14,489,000 | [3] |  |  | $ 19,393,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Diversified Financial Services [Member] | Gibraltar Business Capital L L C [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 1,884,000 |  |  |  | $ 1,884,000 |  |  |  | $ 1,884,000 |  |  |
Shares |  | 830,000 |  |  |  | 830,000 |  |  |  | 830,000 |  |  |
Investment Owned At Fair Value |  | $ 1,134,000 | [3] |  |  | $ 1,134,000 | [3] |  |  | $ 1,225,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Diversified Financial Services [Member] | Gibraltar Business Capital L L C [Member] | Unsecured Debt Eleven Point Five Zero Percentage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Cash |  | 11.50% |  |  |  | 11.50% |  |  |  | 11.50% |  |  |
Investment cost |  | $ 9,844,000 |  |  |  | $ 9,844,000 |  |  |  | $ 9,823,000 |  |  |
Principal Amount |  | 10,000,000 |  |  |  | $ 10,000,000 |  |  |  | $ 10,000,000 |  |  |
Maturity Date |  |  |  |  |  | 2026-09 |  |  |  | 2026-09 |  |  |
Investment Owned At Fair Value |  | $ 9,006,000 | [3] |  |  | $ 9,006,000 | [3] |  |  | $ 9,394,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments | Diversified Financial Services [Member] | Gibraltar Business Capital L L C [Member] | Unsecured Debt Fourteen Point Five Zero Percentage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Cash |  | 14.50% |  |  |  | 14.50% |  |  |  | 14.50% |  |  |
Investment cost |  | $ 14,701,000 |  |  |  | $ 14,701,000 |  |  |  | $ 14,662,000 |  |  |
Principal Amount |  | 15,000,000 |  |  |  | $ 15,000,000 |  |  |  | $ 15,000,000 |  |  |
Maturity Date |  |  |  |  |  | 2026-09 |  |  |  | 2026-09 |  |  |
Investment Owned At Fair Value |  | 13,033,000 | [3] |  |  | $ 13,033,000 | [3] |  |  | $ 13,818,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 516,000 | [1] | 521,000 | [2] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 |  | 0 |  |  |  |  |
Investment cost |  | 22,413,000 |  |  |  | 22,413,000 |  |  |  | 22,413,000 |  |  |
Investment Owned At Fair Value |  | 8,318,000 | [3] | 8,294,000 |  | 8,318,000 | [3] | 8,294,000 |  | 8,269,000 | [4] | 8,600,000 |
Gross Additions |  |  |  |  |  | 0 | [5] | 0 | [6] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7] | 0 | [8] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 49,000 |  | (306,000) |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments | Tectura Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | 22,413,000 |  |  |  | 22,413,000 |  |  |  | 22,413,000 |  |  |
Investment Owned At Fair Value |  | 8,318,000 | [3] |  |  | 8,318,000 | [3] |  |  | 8,269,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments | Tectura Corporation [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 0 | [1],[15] | 0 | [2],[16] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [15] | 0 | [16] |  |  |  |
Investment Owned At Fair Value |  | 0 | [15] | 0 | [16] | 0 | [15] | 0 | [16] | 0 | [15] | 0 | [16]
Gross Additions |  |  |  |  |  | 0 | [5],[15] | 0 | [6],[16] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7],[15] | 0 | [8],[16] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 0 | [15] | 0 | [16] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments | Tectura Corporation [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 0 | [1],[15] | 0 | [2],[16] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [15] | 0 | [16] |  |  |  |
Investment Owned At Fair Value |  | 0 | [15] | 0 | [16] | 0 | [15] | 0 | [16] | 0 | [15] | 0 | [16]
Gross Additions |  |  |  |  |  | 0 | [5],[15] | 0 | [6],[16] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7],[15] | 0 | [8],[16] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 0 | [15] | 0 | [16] |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments | Gibraltar Business Capital L L C [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [13] |  |  |  |  | 0 |  |  |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments | Internet Consumer And Business Services [Member] | Tectura Corporation [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  | $ 900,000 |  |  |  | $ 900,000 |  |  |  | $ 900,000 |  |  |
Shares |  | 414,994,863 |  |  |  | 414,994,863 |  |  |  | 414,994,863 |  |  |
Investment Owned At Fair Value |  | $ 0 | [3] |  |  | $ 0 | [3] |  |  | $ 0 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments | Internet Consumer And Business Services [Member] | Tectura Corporation [Member] | Senior Secured Tranche A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Kind |  | 5.00% |  |  |  | 5.00% |  |  |  | 5.00% |  |  |
Investment cost |  | $ 240,000 |  |  |  | $ 240,000 |  |  |  | $ 240,000 |  |  |
Principal Amount |  | 10,680,000 |  |  |  | $ 10,680,000 |  |  |  | $ 10,680,000 |  |  |
Maturity Date |  |  |  |  |  | 2024-07 |  |  |  | 2024-07 |  |  |
Investment Owned At Fair Value |  | $ 0 | [3] |  |  | $ 0 | [3] |  |  | $ 0 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments | Internet Consumer And Business Services [Member] | Tectura Corporation [Member] | Senior Secured Tranche B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Cash |  | 8.25% |  |  |  | 8.25% |  |  |  | 8.25% |  |  |
Investment cost |  | $ 8,250,000 |  |  |  | $ 8,250,000 |  |  |  | $ 8,250,000 |  |  |
Principal Amount |  | 8,250,000 |  |  |  | $ 8,250,000 |  |  |  | $ 8,250,000 |  |  |
Maturity Date |  |  |  |  |  | 2024-07 |  |  |  | 2024-07 |  |  |
Investment Owned At Fair Value |  | $ 8,250,000 | [3] |  |  | $ 8,250,000 | [3] |  |  | $ 8,250,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments | Internet Consumer And Business Services [Member] | Tectura Corporation [Member] | Senior Secured Tranche C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Interest Rate, Paid in Kind |  | 5.00% |  |  |  | 5.00% |  |  |  | 5.00% |  |  |
Investment cost |  | $ 13,023,000 |  |  |  | $ 13,023,000 |  |  |  | $ 13,023,000 |  |  |
Principal Amount |  | 13,023,000 |  |  |  | $ 13,023,000 |  |  |  | $ 13,023,000 |  |  |
Maturity Date |  |  |  |  |  | 2024-07 |  |  |  | 2024-07 |  |  |
Investment Owned At Fair Value |  | 68,000 | [3] |  |  | $ 68,000 | [3] |  |  | $ 19,000 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments | Internet Consumer And Business Services [Member] | Tectura Corporation [Member] | Preferred Series BB Equity |  |  |  |  |  |  |  |  |  |  |  |  |
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 At Fair Value |  | $ 0 | [3] |  |  | $ 0 | [3] |  |  | $ 0 | [4] |  |
Investment, Affiliated Issuer, Controlled [Member] | Senior Debt [Member] | Other Control Investments | Tectura Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 516,000 | [1],[15] | 521,000 | [2],[16] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [15] | 0 | [16] |  |  |  |
Investment Owned At Fair Value |  | 8,318,000 | [15] | 8,294,000 | [16] | 8,318,000 | [15] | 8,294,000 | [16] | 8,269,000 | [15] | 8,600,000 | [16]
Gross Additions |  |  |  |  |  | 0 | [5],[15] | 0 | [6],[16] |  |  |  |
Gross reductions |  |  |  |  |  | 0 | [7],[15] | 0 | [8],[16] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 49,000 | [15] | (306,000) | [16] |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 1,204,000 | [1] | 3,000 | [2] |  |  |  |
Realized Gain (Loss) |  | (2,014,000) |  | 0 |  | 1,758,000 |  | (62,143,000) |  |  |  |  |
Investment cost |  | 0 |  |  |  | 0 |  |  |  | 13,547,000 |  |  |
Investment Owned At Fair Value |  | 0 |  | 9,712,000 |  | 0 |  | 9,712,000 |  | 9,458,000 | [4] | 8,340,000 |
Gross Additions |  |  |  |  |  | 0 | [5] | 3,328,000 | [6] |  |  |  |
Gross reductions |  |  |  |  |  | (13,547,000) | [7] | 66,176,000 | [8] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  | 4,631,000 |  | (118,000) |  | 4,089,000 |  | 64,220,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Solar Spectrum Holdings L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [9] |  |  | 0 |  |  |  | (62,143,000) |  |  |  |  |
Investment Owned At Fair Value | [9] |  |  | 0 |  |  |  | 0 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [9] |  |  | 0 |  |  |  | 62,183,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Solar Spectrum Holdings L L C [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [2],[17] |  |  |  |  |  |  | 0 |  |  |  |  |
Realized Gain (Loss) | [17] |  |  |  |  |  |  | (61,502,000) |  |  |  |  |
Investment Owned At Fair Value | [17] |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Gross Additions | [6],[17] |  |  |  |  |  |  | 0 |  |  |  |  |
Gross reductions | [8],[17] |  |  |  |  |  |  | 61,502,000 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [17] |  |  |  |  |  |  | 61,502,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Pineapple Energy L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [9] | (2,014,000) | [18] | 0 |  | (2,014,000) | [18] | 0 |  |  |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | 12,547,000 |  |  |
Investment Owned At Fair Value |  | 0 | [9],[18] | 8,469,000 | [9] | 0 | [9],[18] | 8,469,000 | [9] | 8,338,000 | [4] |  |
Net Change in Unrealized Appreciation (Depreciation) | [9] | 4,631,000 | [18] | (52,000) |  | 4,209,000 | [18] | 9,000 |  |  |  |  |
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 |  |  |  |  |  | 0 | [1],[19] | 0 | [2],[20] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 0 | [19] | 0 | [20] |  |  |  |
Investment Owned At Fair Value |  | 0 | [19] | 849,000 | [20] | 0 | [19] | 849,000 | [20] | 591,000 | [19] | 840,000 | [20]
Gross Additions |  |  |  |  |  | 0 | [5],[19] | 0 | [6],[20] |  |  |  |
Gross reductions |  |  |  |  |  | (4,767,000) | [7],[19] | 0 | [8],[20] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | 4,176,000 | [19] | 9,000 | [20] |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Black Crow A I Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) | [9] | 0 | [18] | 0 |  | 3,772,000 | [18] | 0 |  |  |  |  |
Investment Owned At Fair Value | [9] | 0 | [18] | 1,243,000 |  | 0 | [18] | 1,243,000 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [9] | 0 | [18] | (66,000) |  | (120,000) | [18] | 2,028,000 |  |  |  |  |
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 |  |  |  |  |  | 0 | [1],[21] | 0 | [2],[22] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | 3,772,000 | [21] | 0 | [22] |  |  |  |
Investment Owned At Fair Value |  | 0 | [21] | 1,243,000 | [22] | 0 | [21] | 1,243,000 | [22] | 1,120,000 | [21] | 0 | [22]
Gross Additions |  |  |  |  |  | 0 | [5],[21] | 1,000,000 | [6],[22] |  |  |  |
Gross reductions |  |  |  |  |  | (1,000,000) | [7],[21] | 0 | [8],[22] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | (120,000) | [21] | 243,000 | [22] |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Sustainable And Renewable Technology [Member] | Pineapple Energy L L C [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | 4,767,000 |  |  |
Investment Owned At Fair Value | [4] |  |  |  |  |  |  |  |  | 591,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Sustainable And Renewable Technology [Member] | Pineapple Energy L L C [Member] | Senior Secured Tranche A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | 7,500,000 |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  | 7,500,000 |  |  |
Investment Owned At Fair Value | [4] |  |  |  |  |  |  |  |  | 7,500,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Sustainable And Renewable Technology [Member] | Pineapple Energy L L C [Member] | Senior Secured Tranche B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | 280,000 |  |  |
Investment Owned At Fair Value | [4] |  |  |  |  |  |  |  |  | 247,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Internet Consumer And Business Services [Member] | Black Crow A I Inc [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment cost |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |
Shares |  |  |  |  |  |  |  |  |  | 872,797 |  |  |
Investment Owned At Fair Value | [4] |  |  |  |  |  |  |  |  | $ 1,120,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Senior Debt [Member] | Solar Spectrum Holdings L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [2],[17] |  |  |  |  |  |  | 0 |  |  |  |  |
Realized Gain (Loss) | [17] |  |  |  |  |  |  | (641,000) |  |  |  |  |
Investment Owned At Fair Value | [17] |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Gross Additions | [6],[17] |  |  |  |  |  |  | 0 |  |  |  |  |
Gross reductions | [8],[17] |  |  |  |  |  |  | 681,000 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [17] |  |  |  |  |  |  | 681,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Senior Debt [Member] | Pineapple Energy L L C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating |  |  |  |  |  | 1,204,000 | [1],[19] | 3,000 | [2],[20] |  |  |  |
Realized Gain (Loss) |  |  |  |  |  | (2,014,000) | [19] | 0 | [20] |  |  |  |
Investment Owned At Fair Value |  | $ 0 | [19] | 7,620,000 | [20] | 0 | [19] | 7,620,000 | [20] | $ 7,747,000 | [19] | 7,500,000 | [20]
Gross Additions |  |  |  |  |  | 0 | [5],[19] | 120,000 | [6],[20] |  |  |  |
Gross reductions |  |  |  |  |  | (7,780,000) | [7],[19] | 0 | [8],[20] |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  |  |  | $ 33,000 | [19] | 0 | [20] |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Convertible Debt [Member] | Black Crow A I Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Investment Income, Operating | [2],[22] |  |  |  |  |  |  | 0 |  |  |  |  |
Realized Gain (Loss) | [22] |  |  |  |  |  |  | 0 |  |  |  |  |
Investment Owned At Fair Value | [22] |  |  | $ 0 |  |  |  | 0 |  |  |  | $ 0 |
Gross Additions | [6],[22] |  |  |  |  |  |  | 2,208,000 |  |  |  |  |
Gross reductions | [8],[22] |  |  |  |  |  |  | 3,993,000 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | [22] |  |  |  |  |  |  | $ 1,785,000 |  |  |  |  |
[1] | Represents the total amount of interest, fees, or dividends credited to income for the period an investment was an affiliate or control investment.
[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] | All of the Company’s control and affiliate investments are Level 3 investments valued using significant unobservable inputs.
[4] | All of the Company’s control and affiliate investments are Level 3 investments valued using significant unobservable inputs.
[5] | 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.
[6] | 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.
[7] | 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.
[8] | 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.
[9] | 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 September 30, 2022 and September 30, 2021, there were no unconsolidated subsidiaries that are considered “significant subsidiaries”.
[10] | Hercules Adviser LLC is a wholly owned subsidiary providing investment management and other services to the Adviser Funds and other External Parties.
[11] | Hercules Adviser LLC is a wholly-owned subsidiary providing investment management and other services to External Parties.
[12] | 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.
[13] | 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.
[14] | 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.
[15] | 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.
[16] | 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.
[17] | As of June 30, 2021, the Company’s investments in Solar Spectrum Holdings LLC (p.k.a. Sungevity, Inc.) were written off for a realized loss.
[18] | As of September 30, 2022, Black Crow AI, Inc. and Pineapple Energy LLC are no longer affiliates as defined under the 1940 Act.
[19] | During the three months ended September 30, 2022, the Company sold a portion of its investments in Pineapple Energy LLC, as a result it is no longer an affiliate investment..
[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 nine months ended September 30, 2022, the Company sold its investments in Black Crow AI, Inc., as a result it is no longer an affiliate investment.
[22] | As of March 23, 2021, the Company's investment in Black Crow AI, Inc. 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.

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