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Consolidated Schedule of Investments (Unaudited) - Investments (Details) - USD ($) | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Investments at cost | $ 686,193,000 |  | $ 766,774,000 |  |  |
Investments at fair value | 603,514,000 |  | 697,891,000 |  |  |
Unrestricted Short Term Investments [Member] |  |  |  |  |  |
Investments at cost | 43,828,000 |  | 27,266,000 |  |  |
Investments at fair value | 43,828,000 |  | 27,266,000 |  |  |
Restricted Short Term Investments [Member] |  |  |  |  |  |
Investments at cost | 2,417,000 |  | 3,338,000 |  |  |
Investments at fair value | 2,417,000 |  | 3,338,000 |  |  |
Equity Securities [Member] |  |  |  |  |  |
Investments at cost | 39,122,000 |  | 35,942,000 |  |  |
Investments at fair value | 23,699,000 |  | 26,198,000 |  |  |
Warrant [Member] |  |  |  |  |  |
Investments at cost | 15,370,000 |  | 15,956,000 |  |  |
Investments at fair value | 16,444,000 |  | 18,277,000 |  |  |
U S Bank Money Market Deposit Account [Member] | Unrestricted Short Term Investments [Member] |  |  |  |  |  |
Investments at cost | 43,828,000 |  | 27,266,000 |  |  |
Investments at fair value | 43,828,000 |  | 27,266,000 |  |  |
U S Bank Money Market Deposit Account [Member] | Restricted Short Term Investments [Member] |  |  |  |  |  |
Investments at cost | 2,417,000 |  | 3,338,000 |  |  |
Investments at fair value | 2,417,000 |  | 3,338,000 |  |  |
Other Sustainability Sector [Member] |  |  |  |  |  |
Investments at cost | 44,562,000 |  | 66,151,000 |  |  |
Investments at fair value | 44,659,000 |  | 66,079,000 |  |  |
Software Sector [Member] |  |  |  |  |  |
Investments at cost | 151,884,000 |  | 154,040,000 |  |  |
Investments at fair value | 142,835,000 |  | 151,043,000 |  |  |
Biotechnology Sector [Member] |  |  |  |  |  |
Investments at cost | 101,585,000 |  | 118,221,000 |  |  |
Investments at fair value | 66,100,000 |  | 97,562,000 |  |  |
Medical Device Sector [Member] |  |  |  |  |  |
Investments at cost | 219,162,000 |  | 213,564,000 |  |  |
Investments at fair value | 212,678,000 |  | 205,634,000 |  |  |
Energy Efficiency [Member] |  |  |  |  |  |
Investments at cost | 125,000 |  | 9,818,000 |  |  |
Investments at fair value | 25,000 |  | 9,712,000 |  |  |
Other Healthcare Sector [Member] |  |  |  |  |  |
Investments at cost | 39,557,000 |  | 39,533,000 |  |  |
Investments at fair value | 35,359,000 |  | 40,144,000 |  |  |
Networking Sector [Member] |  |  |  |  |  |
Investments at cost | 364,000 |  | 10,070,000 |  |  |
Investments at fair value | 119,000 |  | 9,827,000 |  |  |
Diagnostics Sector [Member] |  |  |  |  |  |
Investments at cost | 17,581,000 |  | 16,704,000 |  |  |
Investments at fair value | 19,309,000 |  | 13,701,000 |  |  |
Communications Sector [Member] |  |  |  |  |  |
Investments at cost | 522,000 |  | 11,711,000 |  |  |
Investments at fair value | 3,321,000 |  | 14,763,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] |  |  |  |  |  |
Investments at cost | 10,735,000 |  | 44,780,000 |  |  |
Investments at fair value | 1,116,000 | $ 10,455,000 | 31,819,000 | $ 19,731,000 | $ 11,386,000 | $ 14,223,000
Investment, Affiliated Issuer, Controlled [Member] | Other Investments [Member] |  |  |  |  |  |
Investments at cost |  |  | 5,880,000 |  |  |
Investments at fair value |  |  | 6,230,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Debt Securities [Member] |  |  |  |  |  |
Investments at cost | 984,000 |  | 17,611,000 |  |  |
Investments at fair value | 1,116,000 |  | 7,668,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Equity Securities [Member] |  |  |  |  |  |
Investments at cost | 9,751,000 |  | 21,289,000 |  |  |
Investments at fair value | 0 |  | 17,921,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Nexii Building Solutions, Inc [Member] |  |  |  |  |  |
Investments at fair value | 1,116,000 | 8,711,000 | 8,547,000 | 7,177,000 | 0 | 0
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] |  |  |  |  |  |
Investments at fair value | 0 | 879,000 | 0 | 6,264,000 | 5,550,000 | 7,993,000
Investment, Affiliated Issuer, Controlled [Member] | Swift Health Systems Inc. [Member] |  |  |  |  |  |
Investments at fair value | 0 | 0 | 17,042,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member] |  |  |  |  |  |
Investments at fair value | 0 | 865,000 | 6,230,000 | 6,290,000 | 5,836,000 | 6,230,000
Investment, Affiliated Issuer, Controlled [Member] | Other Sustainability Sector [Member] | Nexii Building Solutions, Inc [Member] | Term Loan, Fixed Index One [Member] |  |  |  |  |  |
Principal Amount |  |  | 790,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Sustainability Sector [Member] | Nexii Building Solutions, Inc [Member] | Term Loan, Fixed Index One [Member] |  |  |  |  |  |
Principal Amount | 790,000 |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Sustainability Sector [Member] | Nexii Building Solutions, Inc [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost |  |  | 3,297,000 |  |  |
Investments at fair value |  |  | $ 0 |  |  |
Number of Shares (in shares) |  |  | 108,320 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Sustainability Sector [Member] | Nexii Building Solutions, Inc [Member] | Term Loan, Fixed Index Two [Member] |  |  |  |  |  |
Principal Amount | 304,000 |  |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Other Sustainability Sector [Member] | Nexii Building Solutions, Inc [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost | 9,751,000 |  | $ 3,419,000 |  |  |
Investments at fair value | $ 0 |  | $ 7,909,000 |  |  |
Number of Shares (in shares) | 168,377 |  | 542 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Biotechnology Sector [Member] | HIMV LLC [Member] | Other Investments [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 5,880,000 |  |  |
Investments at fair value |  |  | 6,230,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Medical Device Sector [Member] | Swift Health Systems Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,948,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Medical Device Sector [Member] | Swift Health Systems Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,948,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Medical Device Sector [Member] | Swift Health Systems Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,948,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Medical Device Sector [Member] | Swift Health Systems Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,948,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Medical Device Sector [Member] | Swift Health Systems Inc. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount |  |  | 315,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Medical Device Sector [Member] | Swift Health Systems Inc. [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount |  |  | 156,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Medical Device Sector [Member] | Swift Health Systems Inc. [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost |  |  | 10,012 |  |  |
Investments at fair value |  |  | $ 10,012 |  |  |
Number of Shares (in shares) |  |  | 3,588,505 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer-related Technologies [Member] | Better Place Forests Co. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 4,012,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer-related Technologies [Member] | Better Place Forests Co. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,006,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer-related Technologies [Member] | Better Place Forests Co. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 538,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer-related Technologies [Member] | Better Place Forests Co. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount |  |  | 532,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer-related Technologies [Member] | Better Place Forests Co. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount |  |  | 521,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer-related Technologies [Member] | Better Place Forests Co. [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount |  |  | 513,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer-related Technologies [Member] | Better Place Forests Co. [Member] | Term Loan, Prime Index, Seven [Member] |  |  |  |  |  |
Principal Amount |  |  | 505,000 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer-related Technologies [Member] | Better Place Forests Co. [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost |  |  | 639,000 |  |  |
Investments at fair value |  |  | $ 0 |  |  |
Number of Shares (in shares) |  |  | 2,278,272 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Consumer-related Technologies [Member] | Better Place Forests Co. [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 3,922,000 |  |  |
Investments at fair value |  |  | $ 0 |  |  |
Number of Shares (in shares) |  |  | 5,350,142 |  |  |
Investment, Unaffiliated Issuer [Member] |  |  |  |  |  |
Investments at cost | $ 616,488,000 |  | $ 694,503,000 |  |  |
Investments at fair value | 557,582,000 |  | 657,765,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Investments [Member] |  |  |  |  |  |
Investments at cost | 26,067,000 |  | 8,465,000 |  |  |
Investments at fair value | 1,831,000 |  | 100,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Debt Securities [Member] |  |  |  |  |  |
Investments at cost | 564,016,000 |  | 660,556,000 |  |  |
Investments at fair value | 533,963,000 |  | 631,111,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Equity Securities [Member] |  |  |  |  |  |
Investments at cost | 11,162,000 |  | 9,653,000 |  |  |
Investments at fair value | 5,344,000 |  | 8,277,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Warrant [Member] |  |  |  |  |  |
Investments at cost | 15,243,000 |  | 15,829,000 |  |  |
Investments at fair value | 16,444,000 |  | 18,277,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Kodiak Robotics, Inc. [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | 2,600,000 |  |  |  |  |
Investments at fair value | $ 2,004,000 |  |  |  |  |
Number of Shares (in shares) | 292,892 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Castle Creek Biosciences, Inc [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | $ 250,000 |  | 250,000 |  |  |
Investments at fair value | $ 250,000 |  | $ 250,000 |  |  |
Number of Shares (in shares) | 1,162 |  | 1,162 |  |  |
Investment, Unaffiliated Issuer [Member] | Emalex Biosciences, Inc. [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | $ 545,000 |  | $ 356,000 |  |  |
Investments at fair value | $ 656,000 |  | $ 356,000 |  |  |
Number of Shares (in shares) | 47,461 |  | 32,831 |  |  |
Investment, Unaffiliated Issuer [Member] | BioVaxys Technology Corp. [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | $ 14,000 |  |  |  |  |
Investments at fair value | $ 14,000 |  |  |  |  |
Number of Shares (in shares) | 66,170 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | NextCar Holding Company, Inc [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost | $ 89,000 |  | $ 89,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 2,688,971 |  | 2,688,971 |  |  |
Investment, Unaffiliated Issuer [Member] | Axiom Space, Inc [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost | $ 261,000 |  | $ 261,000 |  |  |
Investments at fair value | $ 306,000 |  | $ 306,000 |  |  |
Number of Shares (in shares) | 1,810 |  | 1,810 |  |  |
Investment, Unaffiliated Issuer [Member] | Cognoa, Inc. [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | $ 976,000 |  | $ 487,000 |  |  |
Investments at fair value | $ 975,000 |  | $ 487,000 |  |  |
Number of Shares (in shares) | 16,247,754 |  | 8,123,877 |  |  |
Investment, Unaffiliated Issuer [Member] | Cognoa, Inc. [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost | $ 500,000 |  | $ 250,000 |  |  |
Investments at fair value | $ 500,000 |  | $ 250,000 |  |  |
Number of Shares (in shares) | 2,119,272 |  | 1,059,636 |  |  |
Investment, Unaffiliated Issuer [Member] | Lumithera, Inc. [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 2,000,000 |  |  |
Investments at fair value |  |  | $ 1,700,000 |  |  |
Number of Shares (in shares) |  |  | 392,651 |  |  |
Investment, Unaffiliated Issuer [Member] | Cadrenal Therapeutics, Inc. [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | $ 0 |  | $ 0 |  |  |
Investments at fair value | $ 553,000 |  | $ 580,000 |  |  |
Number of Shares (in shares) | 40,000 |  | 40,000 |  |  |
Investment, Unaffiliated Issuer [Member] | PebblePost, Inc [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost | $ 73,000 |  | $ 73,000 |  |  |
Investments at fair value | $ 73,000 |  | $ 73,000 |  |  |
Number of Shares (in shares) | 56,212 |  | 56,212 |  |  |
Investment, Unaffiliated Issuer [Member] | Caastle, Inc [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost | $ 2,681,000 |  | $ 2,681,000 |  |  |
Investments at fair value | $ 0 |  | $ 2,681,000 |  |  |
Number of Shares (in shares) | 242,180 |  | 242,180 |  |  |
Investment, Unaffiliated Issuer [Member] | Getaround, Inc [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | $ 253,000 |  | $ 253,000 |  |  |
Investments at fair value | $ 0 |  | $ 3,000 |  |  |
Number of Shares (in shares) | 87,082 |  | 87,082 |  |  |
Investment, Unaffiliated Issuer [Member] | SnagAJob.com, Inc [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | $ 9,000 |  | $ 9,000 |  |  |
Investments at fair value | $ 0 |  | $ 83,000 |  |  |
Number of Shares (in shares) | 82,974 |  | 82,974 |  |  |
Investment, Unaffiliated Issuer [Member] | Tigo Energy, Inc. [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | $ 111,000 |  | $ 111,000 |  |  |
Investments at fair value | $ 13,000 |  | $ 5,000 |  |  |
Number of Shares (in shares) | 5,205 |  | 5,205 |  |  |
Investment, Unaffiliated Issuer [Member] | Decisyon, Inc [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost | $ 2,800,000 |  | $ 2,800,000 |  |  |
Investments at fair value | $ 0 |  | $ 1,281,000 |  |  |
Number of Shares (in shares) | 280,000 |  | 280,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Lotame Solutions, Inc. [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 4,000 |  |  |
Investments at fair value |  |  | $ 193,000 |  |  |
Number of Shares (in shares) |  |  | 66,127 |  |  |
Investment, Unaffiliated Issuer [Member] | Lotame Solutions, Inc. [Member] | Preferred Stock 2 [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 29,000 |  |  |
Investments at fair value |  |  | $ 29,000 |  |  |
Number of Shares (in shares) |  |  | 9,381 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | New Aerofarms, Inc. assignee of Aerofarms, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 3,594,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | New Aerofarms, Inc. assignee of Aerofarms, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,594,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Soli Organic, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Soli Organic, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Soli Organic, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Soli Organic, Inc [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Soli Organic, Inc [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Soli Organic, Inc [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Temperpack Technologies, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Temperpack Technologies, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Temperpack Technologies, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 7,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Temperpack Technologies, Inc [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Temperpack Technologies, Inc [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Temperpack Technologies, Inc [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount |  |  | 4,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Sustainability Sector [Member] | Temperpack Technologies, Inc [Member] | Term Loan, Prime Index, Seven [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Kodiak Robotics, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 6,667,000 |  | 10,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Kodiak Robotics, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 6,667,000 |  | 10,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Kodiak Robotics, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 3,333,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Kodiak Robotics, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 3,333,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Kodiak Robotics, Inc. [Member] | Term Loan, Fixed Index Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 250,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Noodle Partners, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 10,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Noodle Partners, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Noodle Partners, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | BrightInsight, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 5,750,000 |  | 7,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | BrightInsight, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 6,708,000 |  | 3,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | BrightInsight, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 3,354,000 |  | 3,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | BrightInsight, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 3,354,000 |  | 2,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | BrightInsight, Inc. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 2,750,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | BrightInsight, Inc. [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount | 2,250,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | OneNetworks, Inc. dba Finexio [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | OneNetworks, Inc. dba Finexio [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Mirantis, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Mirantis, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Mirantis, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Mirantis, Inc [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | MasteryPrep, LLC [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 7,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | MasteryPrep, LLC [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 7,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Elligo Health Research, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 10,000,000 |  | 10,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Elligo Health Research, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Elligo Health Research, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Elligo Health Research, Inc [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Ursa Space Systems Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Ursa Space Systems Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Ursa Space Systems Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Ursa Space Systems Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Viken Detection Corporation [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 3,500,000 |  | 4,833,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Viken Detection Corporation [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 1,750,000 |  | 2,417,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Viken Detection Corporation [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 1,750,000 |  | 2,417,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | SafelyYou, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | SafelyYou, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Supply Network Visibility Holdings, LLC [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Supply Network Visibility Holdings, LLC [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 3,500,000 |  | 3,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Supply Network Visibility Holdings, LLC [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Supply Network Visibility Holdings, LLC [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 1,500,000 |  | 1,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Supply Network Visibility Holdings, LLC [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Hound Labs, Inc. [Member] | Term Loan, Fixed Index One [Member] |  |  |  |  |  |
Principal Amount |  |  | 300,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Britecore Holdings, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Britecore Holdings, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Britecore Holdings, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Britecore Holdings, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Britecore Holdings, Inc. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Britecore Holdings, Inc. [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Crafty Holdings, Inc.[Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Crafty Holdings, Inc.[Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | Crafty Holdings, Inc.[Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | DropOff, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 7,850,000 |  | 6,804,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | DropOff, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 6,804,000 |  | 6,280,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | DropOff, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 6,280,000 |  | 2,617,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | DropOff, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 2,617,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | HappyCo, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 3,000,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | HappyCo, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 3,000,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | HappyCo, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 2,000,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Avalo Therapeutics, Inc. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 311,000 |  | 311,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 149 |  | 117 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 3,333,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,333,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,333,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,333,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 372,000 |  | 214,000 |  |  |
Investments at fair value | $ 413,000 |  | $ 270,000 |  |  |
Number of Shares (in shares) | 13,821 |  | 7,404 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 10,000,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 5,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Castle Creek Biosciences, Inc [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Emalex Biosciences, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 4,167,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Emalex Biosciences, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Emalex Biosciences, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 176,000 |  | 176,000 |  |  |
Investments at fair value | $ 448,000 |  | $ 129,000 |  |  |
Number of Shares (in shares) | 110,402 |  | 110,402 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Emalex Biosciences, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 417,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Emalex Biosciences, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,917,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Imunon, Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 65,000 |  | $ 65,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 19,671 |  | 19,671 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | KSQ Therapeutics, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 6,250,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | KSQ Therapeutics, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 6,250,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | KSQ Therapeutics, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 139,000 |  | 50,000 |  |  |
Investments at fair value | $ 12,000 |  | $ 53,000 |  |  |
Number of Shares (in shares) | 134,614 |  | 48,076 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | KSQ Therapeutics, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 4,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | KSQ Therapeutics, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 4,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | KSQ Therapeutics, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 4,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | KSQ Therapeutics, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 4,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | BioVaxys Technology Corp. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 5,000 |  |  |  |  |
Investments at fair value | $ 1,000 |  |  |  |  |
Number of Shares (in shares) | 400,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Mustang Bio, Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 146,000 |  | $ 146,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 568 |  | 16,611 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Native Microbials, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 2,875,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Native Microbials, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,917,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Native Microbials, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 93,000 |  | 73,000 |  |  |
Investments at fair value | $ 4,000 |  | $ 68,000 |  |  |
Number of Shares (in shares) | 178,631 |  | 112,879 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | PDS Biotechnology Corporation [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 8,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | PDS Biotechnology Corporation [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,281,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | PDS Biotechnology Corporation [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,281,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | PDS Biotechnology Corporation [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 161,000 |  | 160,000 |  |  |
Investments at fair value | $ 0 |  | $ 14,000 |  |  |
Number of Shares (in shares) | 381,625 |  | 299,848 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 3,482,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,482,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,741,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,741,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,741,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,741,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 278,000 |  | 278,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 175,098 |  | 175,098 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 312,000 |  | $ 312,000 |  |  |
Investments at fair value | $ 0 |  | $ 59,000 |  |  |
Number of Shares (in shares) | 709,980 |  | 709,980 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 2,092,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,092,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 1,046,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 1,046,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 1,046,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Provivi, Inc. [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount | 1,046,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Stealth BioTherapeutics Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 2,024,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Stealth BioTherapeutics Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,012,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Stealth BioTherapeutics Inc. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 267,000 |  | 264,000 |  |  |
Investments at fair value | $ 6,000 |  | $ 0 |  |  |
Number of Shares (in shares) | 454,544 |  | 318,181 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Stealth BioTherapeutics Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 202,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Stealth BioTherapeutics Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 101,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Stealth BioTherapeutics Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 304,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Tallac Therapeutics, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Tallac Therapeutics, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Tallac Therapeutics, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 198,000 |  | 194,000 |  |  |
Investments at fair value | $ 0 |  | $ 167,000 |  |  |
Number of Shares (in shares) | 2,266,669 |  | 1,600,002 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Tallac Therapeutics, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 1,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Tallac Therapeutics, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 1,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Greenlight Biosciences, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 1,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Greenlight Biosciences, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Xeris Pharmaceuticals, Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 73,000 |  | 73,000 |  |  |
Investments at fair value | $ 738,000 |  | $ 91,000 |  |  |
Number of Shares (in shares) | 126,000 |  | 126,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Biotechnology Sector [Member] | Long Grove Pharmaceuticals, LLC [Member] | Term Loan, SOFR Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 10,217,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Other Investments [Member] |  |  |  |  |  |
Investments at cost | 15,057,000 |  |  |  |  |
Investments at fair value | 1,831,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Debt Securities [Member] |  |  |  |  |  |
Investments at cost | 272,485,000 |  | $ 263,280,000 |  |  |
Investments at fair value | 266,502,000 |  | 261,520,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Warrant [Member] |  |  |  |  |  |
Investments at cost | 5,451,000 |  | 5,149,000 |  |  |
Investments at fair value | 6,147,000 |  | 6,374,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Magnolia Medical Technologies, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 194,000 |  | 194,000 |  |  |
Investments at fair value | $ 545,000 |  | $ 368,000 |  |  |
Number of Shares (in shares) | 900,043 |  | 809,931 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Spineology, Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 137,000 |  | $ 143,000 |  |  |
Investments at fair value | $ 108,000 |  | $ 108,000 |  |  |
Number of Shares (in shares) | 27,139 |  | 2,714,033 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Spineology, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 37,000 |  | $ 16,000 |  |  |
Investments at fair value | $ 53,000 |  | $ 28,000 |  |  |
Number of Shares (in shares) | 45,101 |  | 2,255,155 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | VERO Biotech LLC [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 379,000 |  | $ 376,000 |  |  |
Investments at fair value | $ 195,000 |  | $ 198,000 |  |  |
Number of Shares (in shares) | 3,701 |  | 3,701 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Meditrina, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 83,000 |  | $ 83,000 |  |  |
Investments at fair value | $ 25,000 |  | $ 34,000 |  |  |
Number of Shares (in shares) | 233,993 |  | 233,993 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | MicroTransponder, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 47,000 |  | $ 47,000 |  |  |
Investments at fair value | $ 50,000 |  | $ 66,000 |  |  |
Number of Shares (in shares) | 103,172 |  | 103,172 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Onkos Surgical, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 192,000 |  | $ 192,000 |  |  |
Investments at fair value | $ 223,000 |  | $ 187,000 |  |  |
Number of Shares (in shares) | 443,674 |  | 443,674 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Scientia Vascular, Inc. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 60,000 |  |  |  |  |
Investments at fair value | $ 60,000 |  |  |  |  |
Number of Shares (in shares) | 24,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Scientia Vascular, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 206,000 |  | $ 103,000 |  |  |
Investments at fair value | $ 604,000 |  | $ 262,000 |  |  |
Number of Shares (in shares) | 49,157 |  | 34,410 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | BioVaxys Technology Corp. [Member] | Royalty Agreement [Member] |  |  |  |  |  |
Investments at cost | $ 5,073,000 |  |  |  |  |
Investments at fair value | 0 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Sonex Health, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 275,000 |  | $ 275,000 |  |  |
Investments at fair value | $ 159,000 |  | $ 266,000 |  |  |
Number of Shares (in shares) | 2,637,133 |  | 2,637,133 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Aerobiotix, LLC [Member] | Royalty Agreement [Member] |  |  |  |  |  |
Investments at cost | $ 1,538,000 |  |  |  |  |
Investments at fair value | 1,448,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Lumithera, Inc. [Member] | Royalty Agreement [Member] |  |  |  |  |  |
Investments at cost | 1,116,000 |  | $ 1,146,000 |  |  |
Investments at fair value | 383,000 |  | 100,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Life Science Segment [Member] | Robin Healthcare, Inc. [Member] | Royalty Agreement [Member] |  |  |  |  |  |
Investments at cost | 7,330,000 |  | 7,319,000 |  |  |
Investments at fair value | 0 |  | 0 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] |  |  |  |  |  |
Investments at cost |  |  | 8,918,000 |  |  |
Investments at fair value |  |  | 10,650,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Other Investments [Member] |  |  |  |  |  |
Investments at cost | 11,010,000 |  |  |  |  |
Investments at fair value | 0 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Debt Securities [Member] |  |  |  |  |  |
Investments at cost | 184,670,000 |  | 222,699,000 |  |  |
Investments at fair value | 160,084,000 |  | 198,350,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Warrant [Member] |  |  |  |  |  |
Investments at cost | 8,459,000 |  |  |  |  |
Investments at fair value | 9,797,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Kodiak Robotics, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | 273,000 |  |  |
Investments at fair value |  |  | $ 15,000 |  |  |
Number of Shares (in shares) |  |  | 639,918 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Noodle Partners, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 116,000 |  | $ 116,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 84,037 |  | 84,037 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Havenly, Inc. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 3,463,000 |  | $ 3,178,000 |  |  |
Investments at fair value | $ 3,510,000 |  | $ 3,106,000 |  |  |
Number of Shares (in shares) | 1,633,929 |  | 1,446,429 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | OneNetworks, Inc. dba Finexio [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 3,000 |  | $ 3,000 |  |  |
Investments at fair value | $ 2,000 |  | $ 3,000 |  |  |
Number of Shares (in shares) | 184,646 |  | 184,646 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Better Place Forests Co. [Member] | Other Investments [Member] |  |  |  |  |  |
Investments at cost | $ 11,010,000 |  |  |  |  |
Investments at fair value | 0 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Revinate Holdings, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 44,000 |  | $ 44,000 |  |  |
Investments at fair value | $ 86,000 |  | $ 90,000 |  |  |
Number of Shares (in shares) | 682,034 |  | 682,034 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | SIGNiX, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 177,000 |  | $ 225,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 186,235 |  | 186,235 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Mirantis, Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 223,000 |  | $ 223,000 |  |  |
Investments at fair value | $ 422,000 |  | $ 585,000 |  |  |
Number of Shares (in shares) | 948,275 |  | 948,275 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Slingshot Aerospace, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 123,000 |  | $ 123,000 |  |  |
Investments at fair value | $ 21,000 |  | $ 66,000 |  |  |
Number of Shares (in shares) | 309,208 |  | 309,208 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Supply Network Visiblity Holdings LLC [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 64,000 |  | $ 65,000 |  |  |
Investments at fair value | $ 71,000 |  | $ 75,000 |  |  |
Number of Shares (in shares) | 682 |  | 682 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | NextCar Holding Company, Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 188,000 |  | $ 188,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 12,618 |  | 12,618 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | NextCar Holding Company, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 9,000 |  | $ 9,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 3,913,723 |  | 3,913,723 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Topia Mobility, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 138,000 |  | $ 138,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 30,496 |  | 30,496 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Ursa Space Systems Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 151,000 |  | $ 151,000 |  |  |
Investments at fair value | $ 140,000 |  | $ 148,000 |  |  |
Number of Shares (in shares) | 1,075,072 |  | 1,075,072 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Viken Detection Corporation [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 120,000 |  | $ 120,000 |  |  |
Investments at fair value | $ 372,000 |  | $ 234,000 |  |  |
Number of Shares (in shares) | 345,443 |  | 345,443 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | xAd, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 177,000 |  | $ 177,000 |  |  |
Investments at fair value | $ 6,000 |  | $ 6,000 |  |  |
Number of Shares (in shares) | 4,343,348 |  | 4,343,348 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Optoro, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 182,000 |  |  |
Investments at fair value |  |  | $ 99,000 |  |  |
Number of Shares (in shares) |  |  | 11,550 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Standvast Holdings, LLC [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 275,000 |  |  |
Investments at fair value |  |  | $ 0 |  |  |
Number of Shares (in shares) |  |  | 1,225,492 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Britecore Holdings, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 98,000 |  | $ 98,000 |  |  |
Investments at fair value | $ 348,000 |  | $ 289,000 |  |  |
Number of Shares (in shares) | 161,215 |  | 161,215 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Axiom Space, Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 50,000 |  | $ 46,000 |  |  |
Investments at fair value | $ 31,000 |  | $ 35,000 |  |  |
Number of Shares (in shares) | 2,654 |  | 1,991 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Intelepeer Holdings, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 138,000 |  | $ 138,000 |  |  |
Investments at fair value | $ 2,911,000 |  | $ 3,156,000 |  |  |
Number of Shares (in shares) | 2,936,535 |  | 2,936,535 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Unagi, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 32,000 |  |  |
Investments at fair value |  |  | $ 0 |  |  |
Number of Shares (in shares) |  |  | 171,081 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Alula Holdings, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 93,000 |  | $ 93,000 |  |  |
Investments at fair value | $ 6,000 |  | $ 7,000 |  |  |
Number of Shares (in shares) | 20,000 |  | 20,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | CAMP NYC, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 57,000 |  | $ 36,000 |  |  |
Investments at fair value | $ 76,000 |  | $ 40,000 |  |  |
Number of Shares (in shares) | 224,712 |  | 112,356 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Clara Foods Co [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 30,000 |  | $ 30,000 |  |  |
Investments at fair value | $ 41,000 |  | $ 43,000 |  |  |
Number of Shares (in shares) | 46,745 |  | 46,745 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Fictiv, Inc. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 59,000 |  |  |
Investments at fair value |  |  | $ 77,000 |  |  |
Number of Shares (in shares) |  |  | 126,841 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Divergent Technologies, Inc. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 80,000 |  | $ 79,000 |  |  |
Investments at fair value | $ 64,000 |  | $ 7,000 |  |  |
Number of Shares (in shares) | 13,068 |  | 9,801 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Divergent Technologies, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 538,000 |  | $ 454,000 |  |  |
Investments at fair value | $ 791,000 |  | $ 440,000 |  |  |
Number of Shares (in shares) | 71,014 |  | 45,273 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Crafty Holdings, Inc.[Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 132,000 |  | $ 132,000 |  |  |
Investments at fair value | $ 132,000 |  | $ 132,000 |  |  |
Number of Shares (in shares) | 243,278 |  | 243,278 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | MyForest Foods Co [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 41,000 |  | $ 29,000 |  |  |
Investments at fair value | $ 47,000 |  | $ 25,000 |  |  |
Number of Shares (in shares) | 500 |  | 250 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | DropOff, Inc. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 455,000 |  | $ 455,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 723,228 |  | 516,535 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Primary Kids, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 57,000 |  | $ 57,000 |  |  |
Investments at fair value | $ 135,000 |  | $ 412,000 |  |  |
Number of Shares (in shares) | 553,778 |  | 553,778 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | HappyCo, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 26,000 |  |  |  |  |
Investments at fair value | $ 24,000 |  |  |  |  |
Number of Shares (in shares) | 96,228 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Quip NYC Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 325,000 |  | $ 325,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 10,833 |  | 6,191 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Updater, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 34,000 |  | $ 34,000 |  |  |
Investments at fair value | $ 26,000 |  | $ 26,000 |  |  |
Number of Shares (in shares) | 108,333 |  | 108,333 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | CPG Beyond, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 242,000 |  | $ 242,000 |  |  |
Investments at fair value | $ 57,000 |  | $ 231,000 |  |  |
Number of Shares (in shares) | 500,000 |  | 500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Silk, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 175,000 |  | $ 175,000 |  |  |
Investments at fair value | $ 106,000 |  | $ 119,000 |  |  |
Number of Shares (in shares) | 394,110 |  | 394,110 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Global Worldwide LLC [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 75,000 |  | $ 75,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 245,810 |  | 245,810 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Rocket Lawyer Incorporated [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 92,000 |  | $ 92,000 |  |  |
Investments at fair value | $ 151,000 |  | $ 319,000 |  |  |
Number of Shares (in shares) | 261,721 |  | 261,721 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Skillshare, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 162,000 |  | $ 162,000 |  |  |
Investments at fair value | $ 0 |  | $ 680,000 |  |  |
Number of Shares (in shares) | 139,316 |  | 139,074 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Liqid, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 364,000 |  | $ 364,000 |  |  |
Investments at fair value | $ 119,000 |  | $ 103,000 |  |  |
Number of Shares (in shares) | 344,102 |  | 344,102 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Avalanche Technology, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 45,000 |  |  |
Investments at fair value |  |  | $ 0 |  |  |
Number of Shares (in shares) |  |  | 5,938 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | E La Carte, Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 60,000 |  | $ 60,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 294,723 |  | 147,361 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Everstream Holdings, LLC [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 82,000 |  | $ 82,000 |  |  |
Investments at fair value | $ 6,000 |  | $ 34,000 |  |  |
Number of Shares (in shares) | 525,000 |  | 525,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Technology Sector [Member] | Lemongrass Holdings, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 57,000 |  | $ 34,000 |  |  |
Investments at fair value | $ 96,000 |  | $ 48,000 |  |  |
Number of Shares (in shares) | 202,616 |  | 101,308 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Ceribell, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 5,000,000 |  | $ 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Ceribell, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Ceribell, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 4,000,000 |  | 4,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Ceribell, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 147,000 |  | 147,000 |  |  |
Investments at fair value | $ 328,000 |  | $ 1,573,000 |  |  |
Number of Shares (in shares) | 89,903 |  | 89,903 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Spineology, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 5,000,000 |  | $ 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Spineology, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 4,250,000 |  | 4,250,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Spineology, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 4,250,000 |  | 4,250,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Spineology, Inc [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Candesant Biomedical, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Candesant Biomedical, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Candesant Biomedical, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Candesant Biomedical, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | 152,000 |  |  |
Investments at fair value |  |  | $ 78,000 |  |  |
Number of Shares (in shares) |  |  | 93,336 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | VERO Biotech LLC [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 15,000,000 |  | $ 15,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | VERO Biotech LLC [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 10,000,000 |  | 10,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | VERO Biotech LLC [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | VERO Biotech LLC [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | MicroTransponder, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 3,750,000 |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | MicroTransponder, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 3,750,000 |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Onkos Surgical, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 10,000,000 |  | 10,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Onkos Surgical, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 10,000,000 |  | 10,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Onkos Surgical, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Onkos Surgical, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Onkos Surgical, Inc. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Conventus Orthopaedics, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 2,801,000 |  | 3,187,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Conventus Orthopaedics, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,801,000 |  | 3,187,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Conventus Orthopaedics, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 268,000 |  | 256,000 |  |  |
Investments at fair value | $ 1,000 |  | $ 102,000 |  |  |
Number of Shares (in shares) | 13,203,395 |  | 9,313,541 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Scientia Vascular, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 10,000,000 |  | $ 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Scientia Vascular, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 10,000,000 |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Scientia Vascular, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Scientia Vascular, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 1,500,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Sonex Health, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Sonex Health, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Sonex Health, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Sonex Health, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Sonex Health, Inc. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 3,750,000 |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Sonex Health, Inc. [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount | 3,750,000 |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Sonex Health, Inc. [Member] | Term Loan, Prime Index, Seven [Member] |  |  |  |  |  |
Principal Amount | 3,750,000 |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Sonex Health, Inc. [Member] | Term Loan, Prime Index, Eight [Member] |  |  |  |  |  |
Principal Amount | 3,750,000 |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | InfoBionic, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | InfoBionic, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | InfoBionic, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | InfoBionic, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 267,000 |  | 231,000 |  |  |
Investments at fair value | $ 324,000 |  | $ 175,000 |  |  |
Number of Shares (in shares) | 7,371,554 |  | 5,361,130 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | MML US, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 2,545,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | MML US, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,545,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | MML US, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,090,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | MML US, Inc [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 5,090,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | MML US, Inc [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 5,052,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | MML US, Inc [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount | 5,052,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | AccuVein Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 7,000 |  |  |
Investments at fair value |  |  | $ 0 |  |  |
Number of Shares (in shares) |  |  | 271 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Aerin Medical, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 65,000 |  | $ 65,000 |  |  |
Investments at fair value | $ 1,347,000 |  | $ 1,418,000 |  |  |
Number of Shares (in shares) | 1,818,183 |  | 1,818,183 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Aerobiotix, LLC [Member] | Term Loan, Fixed Index One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Aerobiotix, LLC [Member] | Term Loan, Fixed Index Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Aerobiotix, LLC [Member] | Term Loan, Fixed Index Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 200,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Aerobiotix, LLC [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | 48,000 |  |  |
Investments at fair value |  |  | $ 16,000 |  |  |
Number of Shares (in shares) |  |  | 8,800 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Canary Medical Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 86,000 |  | $ 86,000 |  |  |
Investments at fair value | $ 1,000 |  | $ 2,000 |  |  |
Number of Shares (in shares) | 12,153 |  | 12,153 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Cognoa, Inc. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 0 |  | $ 0 |  |  |
Investments at fair value | $ 2,000 |  | $ 2,000 |  |  |
Number of Shares (in shares) | 61,170 |  | 30,585 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | Cognoa, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 162,000 |  | $ 162,000 |  |  |
Investments at fair value | $ 3,000 |  | $ 1,000 |  |  |
Number of Shares (in shares) | 7,152,669 |  | 4,635,991 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | CSA Medical, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 174,000 |  | $ 174,000 |  |  |
Investments at fair value | $ 464,000 |  | $ 479,000 |  |  |
Number of Shares (in shares) | 4,939,813 |  | 4,917,794 |  |  |
Investment, Unaffiliated Issuer [Member] | Medical Device Sector [Member] | CVRx, Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 76,000 |  | $ 76,000 |  |  |
Investments at fair value | $ 33,000 |  | $ 160,000 |  |  |
Number of Shares (in shares) | 47,410 |  | 47,410 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Havenly, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 1,333,000 |  | $ 2,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Havenly, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,000,000 |  | 3,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Havenly, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 3,375,000 |  | 2,813,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Havenly, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 2,813,000 |  | 2,813,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Havenly, Inc. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 2,813,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Lyrical Foods, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 2,679,000 |  | 2,679,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Lyrical Foods, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,679,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | NextCar Holding Company, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 6,441,000 |  | 6,042,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | NextCar Holding Company, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,576,000 |  | 3,021,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | NextCar Holding Company, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 3,220,000 |  | 2,417,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | NextCar Holding Company, Inc [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 3,865,000 |  | 3,021,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | NextCar Holding Company, Inc [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 3,220,000 |  | 3,625,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | NextCar Holding Company, Inc [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount | 3,220,000 |  | 3,021,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | NextCar Holding Company, Inc [Member] | Term Loan, Prime Index, Seven [Member] |  |  |  |  |  |
Principal Amount | 6,441,000 |  | 6,042,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | NextCar Holding Company, Inc [Member] | Term Loan, Prime Index, Eight [Member] |  |  |  |  |  |
Principal Amount | 3,220,000 |  | 3,021,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Optoro, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Optoro, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,875,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Standvast Holdings, LLC [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Standvast Holdings, LLC [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Standvast Holdings, LLC [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 2,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Unagi, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 1,415,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Unagi, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 708,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Unagi, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 708,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Consumer-related Technologies [Member] | Crafty Holdings, Inc.[Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Energy Efficiency [Member] | Pivot Bio, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Energy Efficiency [Member] | Pivot Bio, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Sustainability Segment [Member] | Debt Securities [Member] |  |  |  |  |  |
Investments at cost | 4,814,000 |  | 67,637,000 |  |  |
Investments at fair value | 4,814,000 |  | 67,052,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Sustainability Segment [Member] | Warrant [Member] |  |  |  |  |  |
Investments at cost | 385,000 |  | 715,000 |  |  |
Investments at fair value | 120,000 |  | 187,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Sustainability Segment [Member] | Pivot Bio, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 14,000 |  | 14,000 |  |  |
Investments at fair value | $ 12,000 |  | $ 14,000 |  |  |
Number of Shares (in shares) | 210,418 |  | 210,418 |  |  |
Investment, Unaffiliated Issuer [Member] | Sustainability Segment [Member] | New Aerofarms, Inc. assignee of Aerofarms, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 88,000 |  | $ 82,000 |  |  |
Investments at fair value | $ 2,000 |  | $ 17,000 |  |  |
Number of Shares (in shares) | 800,000 |  | 400,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Sustainability Segment [Member] | Soli Organic, Inc [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 20,000 |  |  |
Investments at fair value |  |  | $ 19,000 |  |  |
Number of Shares (in shares) |  |  | 296 |  |  |
Investment, Unaffiliated Issuer [Member] | Sustainability Segment [Member] | Soli Organic, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 382,000 |  |  |
Investments at fair value |  |  | $ 10,000 |  |  |
Number of Shares (in shares) |  |  | 1,075 |  |  |
Investment, Unaffiliated Issuer [Member] | Sustainability Segment [Member] | LiquiGlide, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 53,000 |  | $ 39,000 |  |  |
Investments at fair value | $ 46,000 |  | $ 25,000 |  |  |
Number of Shares (in shares) | 122,717 |  | 61,359 |  |  |
Investment, Unaffiliated Issuer [Member] | Sustainability Segment [Member] | Temperpack Technologies, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 185,000 |  | $ 178,000 |  |  |
Investments at fair value | $ 29,000 |  | $ 102,000 |  |  |
Number of Shares (in shares) | 66,605 |  | 49,693 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Healthcare Sector [Member] | GT Medical Technologies, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 3,750,000 |  | $ 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Healthcare Sector [Member] | GT Medical Technologies, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 3,750,000 |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Healthcare Sector [Member] | GT Medical Technologies, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 7,500,000 |  | 7,500,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Healthcare Sector [Member] | Hometeam Technologies, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Healthcare Sector [Member] | Hometeam Technologies, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Healthcare Sector [Member] | Hometeam Technologies, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Healthcare Sector [Member] | Hometeam Technologies, Inc [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Other Healthcare Sector [Member] | Hometeam Technologies, Inc [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | Debt Securities [Member] |  |  |  |  |  |
Investments at cost | 102,047,000 |  | 106,940,000 |  |  |
Investments at fair value | 102,563,000 |  | 104,189,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | Warrant [Member] |  |  |  |  |  |
Investments at cost | 948,000 |  | 1,047,000 |  |  |
Investments at fair value | 380,000 |  | 1,066,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | BrightInsight, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 167,000 |  | 167,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 123,284 |  | 85,066 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | SafelyYou, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 163,000 |  | $ 163,000 |  |  |
Investments at fair value | $ 142,000 |  | $ 149,000 |  |  |
Number of Shares (in shares) | 206,983 |  | 150,353 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | GT Medical Technologies, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 144,000 |  | $ 83,000 |  |  |
Investments at fair value | $ 152,000 |  | $ 95,000 |  |  |
Number of Shares (in shares) | 326,640 |  | 195,984 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | Hound Labs, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 46,000 |  | $ 45,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 451,796 |  | 451,796 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | Parse Biosciences, Inc. [Member] | Common Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 71,000 |  | $ 71,000 |  |  |
Investments at fair value | $ 22,000 |  | $ 15,000 |  |  |
Number of Shares (in shares) | 32,244 |  | 32,244 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | Parse Biosciences, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 166,000 |  | $ 166,000 |  |  |
Investments at fair value | $ 64,000 |  | $ 15,000 |  |  |
Number of Shares (in shares) | 184,253 |  | 184,253 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | Kate Farms, Inc [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 101,000 |  |  |
Investments at fair value |  |  | $ 700,000 |  |  |
Number of Shares (in shares) |  |  | 82,965 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | Elligo Healthcare Research, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | $ 191,000 |  | $ 191,000 |  |  |
Investments at fair value | $ 0 |  | $ 92,000 |  |  |
Number of Shares (in shares) | 652,250 |  | 652,250 |  |  |
Investment, Unaffiliated Issuer [Member] | Healthcare Information and Services Segment [Member] | Medsphere Systems Corporation [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 60,000 |  |  |
Investments at fair value |  |  | $ 0 |  |  |
Number of Shares (in shares) |  |  | 7,097,792 |  |  |
Investment, Unaffiliated Issuer [Member] | Alternative Energy Sector [Member] | Sparkcharge, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 2,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Alternative Energy Sector [Member] | Sparkcharge, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 2,500,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Alternative Energy Sector [Member] | Sparkcharge, Inc. [Member] | Preferred Stock Warrants [Member] |  |  |  |  |  |
Investments at cost | 45,000 |  |  |  |  |
Investments at fair value | $ 31,000 |  |  |  |  |
Number of Shares (in shares) | 2,264,151 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Networking Sector [Member] | Fictiv, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | $ 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Networking Sector [Member] | Fictiv, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Diagnostics Sector [Member] | Hound Labs, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | $ 1,929,000 |  | 1,607,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Diagnostics Sector [Member] | Hound Labs, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 1,607,000 |  | 1,607,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Diagnostics Sector [Member] | Hound Labs, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 1,607,000 |  | 3,214,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Diagnostics Sector [Member] | Hound Labs, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 964,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Diagnostics Sector [Member] | Hound Labs, Inc. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 3,214,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Diagnostics Sector [Member] | Hound Labs, Inc. [Member] | Term Loan, Fixed Index One [Member] |  |  |  |  |  |
Principal Amount | 300,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Diagnostics Sector [Member] | Hound Labs, Inc. [Member] | Term Loan, Fixed Index Two [Member] |  |  |  |  |  |
Principal Amount | 250,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Diagnostics Sector [Member] | Parse Biosciences, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Diagnostics Sector [Member] | Parse Biosciences, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  |  |  |  |
Investment, Unaffiliated Issuer [Member] | Diagnostics Sector [Member] | Parse Biosciences, Inc. [Member] | Term Loan, Fixed Index Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 5,000,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Communications Sector [Member] | Axiom Space, Inc [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Communications Sector [Member] | Axiom Space, Inc [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,750,000 |  |  |
Investment, Unaffiliated Issuer [Member] | Communications Sector [Member] | Axiom Space, Inc [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount |  |  | 3,750,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] |  |  |  |  |  |
Investments at cost | 58,970,000 |  | 27,491,000 |  |  |
Investments at fair value | 44,816,000 | 6,707,000 | 8,307,000 | 8,307,000 | 15,847,000 | 1,132,000
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Investments [Member] |  |  |  |  |  |
Investments at cost | 20,342,000 |  | 22,364,000 |  |  |
Investments at fair value | 1,350,000 |  | 8,307,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Debt Securities [Member] |  |  |  |  |  |
Investments at cost | 20,292,000 |  |  |  |  |
Investments at fair value | 25,111,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Equity Securities [Member] |  |  |  |  |  |
Investments at cost | 18,209,000 |  | 5,000,000 |  |  |
Investments at fair value | 18,355,000 |  | 0 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Warrant [Member] |  |  |  |  |  |
Investments at cost | 127,000 |  | 127,000 |  |  |
Investments at fair value | 0 |  | 0 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] |  |  |  |  |  |
Investments at fair value | 1,350,000 | 6,707,000 | 8,307,000 | 8,307,000 | 15,847,000 | 1,132,000
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member] |  |  |  |  |  |
Investments at fair value | 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Sustainability Sector [Member] | Shengrow, Inc. aka Soli Organic, Inc. [Member] | Term Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 5,092,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Sustainability Sector [Member] | Shengrow, Inc. aka Soli Organic, Inc. [Member] | Term Loan, Prime Index, Two [Member] |  |  |  |  |  |
Principal Amount | 3,394,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Sustainability Sector [Member] | Shengrow, Inc. aka Soli Organic, Inc. [Member] | Term Loan, Prime Index, Three [Member] |  |  |  |  |  |
Principal Amount | 1,697,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Sustainability Sector [Member] | Shengrow, Inc. aka Soli Organic, Inc. [Member] | Term Loan, Prime Index, Four [Member] |  |  |  |  |  |
Principal Amount | 3,394,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Sustainability Sector [Member] | Shengrow, Inc. aka Soli Organic, Inc. [Member] | Term Loan, Prime Index, Five [Member] |  |  |  |  |  |
Principal Amount | 1,697,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Sustainability Sector [Member] | Shengrow, Inc. aka Soli Organic, Inc. [Member] | Term Loan, Prime Index, Six [Member] |  |  |  |  |  |
Principal Amount | 3,394,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Sustainability Sector [Member] | Shengrow, Inc. aka Soli Organic, Inc. [Member] | Term Loan, Prime Index, Seven [Member] |  |  |  |  |  |
Principal Amount | 1,697,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Sustainability Sector [Member] | Shengrow, Inc. aka Soli Organic, Inc. [Member] | Revolver Loan, Prime Index, One [Member] |  |  |  |  |  |
Principal Amount | 5,000,000 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Sustainability Sector [Member] | Shengrow, Inc. aka Soli Organic, Inc. [Member] | Preferred Stock [Member] |  |  |  |  |  |
Investments at cost | 13,209,000 |  |  |  |  |
Investments at fair value | $ 18,355,000 |  |  |  |  |
Number of Shares (in shares) | 1,835,534 |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Biotechnology Sector [Member] | Evelo Biosciences, Inc. [Member] | Other Investments, Prime Index, One [Member] |  |  |  |  |  |
Investments at cost |  |  | 4,910,000 |  |  |
Investments at fair value |  |  | 1,825,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Biotechnology Sector [Member] | Evelo Biosciences, Inc. [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | $ 5,000,000 |  | 5,000,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 2,164,502 |  | 2,164,502 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Biotechnology Sector [Member] | Evelo Biosciences, Inc. [Member] | Other Investments, Prime Index, Two [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 7,634,000 |  |  |
Investments at fair value |  |  | 2,832,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Biotechnology Sector [Member] | Evelo Biosciences, Inc. [Member] | Other Investments [Member] |  |  |  |  |  |
Investments at cost | $ 20,342,000 |  |  |  |  |
Investments at fair value | $ 1,350,000 |  |  |  |  |
Number of Shares (in shares) |  |  |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Biotechnology Sector [Member] | Evelo Biosciences, Inc. [Member] | Other Investments, Prime Index, Three [Member] |  |  |  |  |  |
Investments at cost |  |  | 2,946,000 |  |  |
Investments at fair value |  |  | 1,095,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Biotechnology Sector [Member] | Evelo Biosciences, Inc. [Member] | Other Investments, Prime Index, Four [Member] |  |  |  |  |  |
Investments at cost |  |  | 2,946,000 |  |  |
Investments at fair value |  |  | 1,095,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Biotechnology Sector [Member] | Evelo Biosciences, Inc. [Member] | Warrant [Member] |  |  |  |  |  |
Investments at cost | $ 127,000 |  | 127,000 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 23,196 |  | 23,196 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Biotechnology Sector [Member] | Evelo Biosciences, Inc. [Member] | Other Investments, Prime Index, Five [Member] |  |  |  |  |  |
Investments at cost |  |  | $ 1,964,000 |  |  |
Investments at fair value |  |  | 730,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Biotechnology Sector [Member] | Evelo Biosciences, Inc. [Member] | Other Investments, Prime Index, Six [Member] |  |  |  |  |  |
Investments at cost |  |  | 1,964,000 |  |  |
Investments at fair value |  |  | 730,000 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Medical Device Sector [Member] | Aulea Medical, Inc. [Member] | Common Stock [Member] |  |  |  |  |  |
Investments at cost | $ 0 |  | 0 |  |  |
Investments at fair value | $ 0 |  | $ 0 |  |  |
Number of Shares (in shares) | 660,537 |  | 660,537 |  |  |

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