2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Net Investment Income [Line Items]
Derivative asset	$ 1,846	$ 2,956
Amount
Net Investment Income [Line Items]
Derivative asset	1,846	2,956
Investment in debt security	696	610
Total	2,542	3,566
Level 1
Net Investment Income [Line Items]
Derivative asset	0	0
Investment in debt security	0	0
Total	0	0
Level 2
Net Investment Income [Line Items]
Derivative asset	0	0
Investment in debt security	0	0
Total	0	0
Level 3
Net Investment Income [Line Items]
Derivative asset	1,846	2,956
Investment in debt security	696	610
Total	$ 2,542	$ 3,566