CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS (Parentheticals) - $ / shares |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Statement of Stockholders' Equity [Abstract] | ||||||||||
| Net investment income (loss) (in USD per share) | $ 0.99 | $ 0.64 | $ 1.08 | $ 0.92 | $ 0.91 | $ 0.83 | $ 0.75 | $ 0.69 | $ 0.84 | $ 0.75 |
| Gain (loss) on investment (in USD per share) | $ 0.51 | $ 1.02 | $ 1.12 | $ 0.49 | $ 0.26 | $ 0.10 | $ 0.28 | $ 0.24 | $ 0.05 | $ 0 |