| Line Item | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 | Sep 30, 2023 | Jun 30, 2023 | Mar 31, 2023 | Dec 31, 2022 | Sep 30, 2022 |
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| Interest and dividend income: | ||||||||||||||||
| Total interest and dividend income | ||||||||||||||||
| Fee and other income: | ||||||||||||||||
| Total fee and other income | ||||||||||||||||
| Total investment income | ||||||||||||||||
| EXPENSES: | ||||||||||||||||
| Interest expense and other debt financing costs | ||||||||||||||||
| Compensation and benefits | ||||||||||||||||
| Professional fees | ||||||||||||||||
| General and administrative | ||||||||||||||||
| Total gross expenses | ||||||||||||||||
| Allocated expenses to Trinity Capital Adviser, LLC | ||||||||||||||||
| Total net expenses | ||||||||||||||||
| NET INVESTMENT INCOME/(LOSS) BEFORE TAXES | ||||||||||||||||
| Excise tax expense | ||||||||||||||||
| NET INVESTMENT INCOME | ||||||||||||||||
| NET REALIZED GAIN/(LOSS) FROM INVESTMENTS: | ||||||||||||||||
| Net realized gain/(loss) from investments | ||||||||||||||||
| NET CHANGE IN UNREALIZED APPRECIATION/(DEPRECIATION) FROM INVESTMENTS: | ||||||||||||||||
| Net change in unrealized appreciation/(depreciation) from investments | ||||||||||||||||
| NET INCREASE/(DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS | ||||||||||||||||
| NET INVESTMENT INCOME PER SHARE - BASIC | ||||||||||||||||
| NET INVESTMENT INCOME PER SHARE - DILUTED | ||||||||||||||||
| NET CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER SHARE - BASIC | ||||||||||||||||
| NET CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER SHARE - DILUTED | — |