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FINANCIAL HIGHLIGHTS (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Investment Company, Financial Highlights [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net asset value at beginning of period (in USD per share) | $ 13.09 | $ 13.43 | $ 11.52 | $ 11.17 | $ 12.40 | $ 10.85 | $ 9.95 | $ 9.22 | $ 9.18 | $ 8.34
Income from investment operations |  |  |  |  |  |  |  |  |  |
Net investment income (in USD per share) | 0.63 | 1.11 | 0.45 | 0.54 | 1.11 | 0.23 | 0.68 | 0.74 | 0.68 | 0.75
Net realized gain (loss) on investments and other (in USD per share) | 0.88 | 0.32 | 0.37 | 0.32 | 1.36 | 2.04 | 0.04 | 0.51 | (0.15) | 0
Taxes on deemed distributions of long-term capital gains (in USD per share) | 0 | 0 | 0 | 0 | (0.31) | (0.41) | 0 | 0 | 0 | 0
Net unrealized appreciation (depreciation) of investments and other (in USD per share) | 0.96 | (0.36) | 2.26 | 0.42 | (2.38) | 0.63 | 1.16 | 0.23 | 0.29 | 1.13
Total from investment operations (in USD per share) | 2.47 | 1.07 | 3.08 | 1.28 | (0.22) | 2.49 | 1.88 | 1.48 | 0.82 | 1.88
Effect of equity capital activity |  |  |  |  |  |  |  |  |  |
Cash distributions to common stockholders from net investment income (in USD per share) | (1.08) | (0.92) | (0.91) | (0.83) | (0.75) | (0.69) | (0.84) | (0.75) | (0.64) | (0.77)
Cash distributions to common stockholders from net realized gains (in USD per share) | (1.12) | (0.49) | (0.26) | (0.10) | (0.28) | (0.24) | (0.05) | 0 | (0.11) | 0
Discounts, commissions, and offering costs par share (in USD per share) | (0.02) | (0.01) | 0 | 0 | 0 | 0 | (0.03) | 0 | (0.01) | (0.03)
Net accretive (dilutive) effect of equity offering (in USD per share) | 0.10 | 0.01 | 0 | 0 | 0.01 | 0 | (0.04) | 0 | (0.03) | (0.22)
Total from equity capital activity (in USD per share) | (2.12) | (1.41) | (1.17) | (0.93) | (1.02) | (0.93) | (0.96) | (0.75) | (0.79) | (1.02)
Other, net (in USD per share) | (0.01) | 0 | 0 | 0 | 0.01 | (0.01) | (0.02) | 0 | 0.01 | (0.02)
Net asset value at end of period (in USD per share) | 13.43 | 13.09 | 13.43 | 11.52 | 11.17 | 12.40 | 10.85 | 9.95 | 9.22 | 9.18
Per common share market value at beginning of period (in USD per share) | 13.25 | 16.13 | 12.23 | 7.85 | 11.60 | 10.10 | 9.07 | 7.02 | 7.40 | 8.27
Per common share market value at end of period (in USD per share) | $ 14.23 | $ 13.25 | $ 16.13 | $ 12.23 | $ 7.85 | $ 11.60 | $ 10.10 | $ 9.07 | $ 7.02 | $ 7.40
Total investment return | 25.52% | (8.90%) | 42.40% | 70.65% | (26.23%) | 24.95% | 21.82% | 41.58% | 4.82% | 11.96%
Common stock outstanding at end of period (in shares) | 36,688,667 | 33,591,505 | 33,205,023 | 33,205,023 | 33,049,463 | 32,822,459 | 32,653,635 | 30,270,958 | 30,270,958 | 29,775,958
Consolidated Statement of Assets and Liabilities Data: |  |  |  |  |  |  |  |  |  |
Net assets at end of year | $ 492,711 | $ 439,742 | $ 445,830 | $ 382,364 | $ 369,031 | $ 407,110 | $ 354,200 | $ 301,082 | $ 279,022 | $ 273,429
Average net assets | 461,819 | 446,899 | 425,985 | 365,568 | 404,336 | 391,786 | 328,533 | 294,030 | 276,293 | 229,350
Senior Securities Data: |  |  |  |  |  |  |  |  |  |
Total borrowings, at cost | 404,238 | 297,688 | 267,584 | 155,434 | 54,296 | 58,096 | 112,096 | 74,796 | 100,096 | 123,896
Mandatorily redeemable preferred stock | $ 0 | $ 0 | $ 0 | $ 94,371 | $ 132,250 | $ 132,250 | $ 139,150 | $ 139,150 | $ 121,650 | $ 81,400
Ratios/Supplemental Data: |  |  |  |  |  |  |  |  |  |
Ratio of net expenses to average net assets | 14.19% | 9.97% | 13.51% | 10.58% | 6.32% | 13.30% | 11.08% | 10.02% | 10.94% | 9.48%
Ratio of net investment income to average net assets | 4.72% | 8.28% | 3.52% | 4.91% | 8.99% | 1.92% | 6.68% | 7.63% | 7.50% | 8.68%
Ratio of expenses to average net assets - annualized | 17.38% | 12.58% | 16.72% | 13.33% | 9.12% | 16.45% | 14.11% | 13.46% | 14.50% | 12.90%
Ratio of net expenses to average net assets |  |  |  |  | 6.89% | 14.07% |  |  |  |
Ratio of net investment income (loss) to average net assets – annualized | 1.53% | 5.66% | 0.31% | 2.16% | 6.20% | (1.22%) | 3.66% | 4.19% | 3.94% | 5.26%

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