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INCOME TAXES - Net Assets Resulting From Operations To Estimated RIC Taxable Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net increase in net assets from operations | $ 18,176 | $ 2,949 | $ 9,458 | $ 2,510 | $ 19,669 | $ 12,560 | $ (4,556) | $ 15,142 | $ 33,093 | $ 42,815 | $ 50,883
Net unrealized depreciation (appreciation) on investments |  |  |  |  |  |  |  |  | 18,589 | (11,467) | (28,755)
Income/gain (expense/loss) recognized for tax on pass-through entities |  |  |  |  |  |  |  |  | 962 | 3,753 | (11,000)
(Gain) loss recognized on dispositions |  |  |  |  |  |  |  |  | (1,473) | 152 | 2,206
Capital loss carryover |  |  |  |  |  |  |  |  | 12,796 | (878) | 17,924
Net operating income - wholly-owned subsidiary |  |  |  |  |  |  |  |  | 809 | (10,757) | (378)
Dividend income from wholly-owned subsidiary |  |  |  |  |  |  |  |  | 1,068 | 4,000 | 0
Non-deductible tax expense |  |  |  |  |  |  |  |  | 628 | 65 | 1,066
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (2,726) | 12,268 | 0
Non-deductible compensation |  |  |  |  |  |  |  |  | 3,243 | 3,679 | 0
Compensation related book/tax differences |  |  |  |  |  |  |  |  | 812 | 36 | 0
Interest on non-accrual loans |  |  |  |  |  |  |  |  | 3,343 | 4,171 | 0
Other book/tax differences |  |  |  |  |  |  |  |  | 1,191 | 1,530 | 870
Estimated distributable income before deductions for distributions |  |  |  |  |  |  |  |  | 72,335 | 49,367 | 32,816
Ordinary |  |  |  |  |  |  |  |  | 70,034 | 57,518 | 38,917
Capital gains |  |  |  |  |  |  |  |  | 0 | 0 | 0
Deemed distributions |  |  |  |  |  |  |  |  | 0 | 0 | 0
Distributions payable |  |  |  |  |  |  |  |  | 0 | 0 | 0
Estimated annual RIC undistributed taxable income |  |  |  |  |  |  |  |  | 2,301 | $ (8,151) | $ (6,101)
Capital loss carryover | $ 30,200 |  |  |  |  |  |  |  | $ 30,200 |  |

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