NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS PER WEIGHTED AVERAGE COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Numerator: basic and diluted net increase (decrease) in net assets resulting from operations per common share	$ 5,698	$ 12,103
Denominator: basic weighted average common share (in shares)	35,207,208	34,304,371
Denominator: diluted weighted average common share (in shares)	35,207,208	34,304,371
Basic net increase (decrease) in net assets resulting from operations (in USD per share)	$ 0.16	$ 0.35
Diluted net increase (decrease) in net assets resulting from operations (in USD per share)	$ 0.16	$ 0.35