INCOME TAXES - Net Assets Resulting From Operations To Estimated RIC Taxable Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Net increase resulting from operations	$ 23,812	$ 2,510
Net unrealized depreciation (appreciation) on investments	(12,038)	12,248
(Expense/loss) income/gain recognized for tax on pass-through entities	(4,202)	40
(Gain) loss recognized on dispositions	(1,641)	0
Capital loss carryover	17,932	(1,567)
Net operating income - wholly-owned subsidiary	(1,796)	(1,534)
Dividend income from wholly-owned subsidiary	0	907
Non-deductible tax expense	93	73
Loss on extinguishment of debt	(682)	(682)
Non-deductible compensation	892	822
Compensation related book/tax differences	(5,824)	(5,529)
Interest on non-accrual loans	1,415	1,128
Other book/tax differences	1,610	257
Estimated distributable income before deductions for distributions	19,571	$ 8,673
Capital loss carryover	$ 49,100