INCOME (LOSS) PER SHARE - Reconciliation of basic net loss to diluted net loss per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
INCOME (LOSS) PER SHARE
Net income (loss) applicable to common shareholders	$ 10,895	$ (4,685)
Diluted net income (loss) applicable to common shareholders	$ 2,573	$ (4,685)
Weighted average common shares outstanding, basic (in thousands) (in shares)	13,191	10,851
Weighted average common shares outstanding, diluted (in thousands) (in shares)	13,865	10,851
Net income (loss) per share, basic (in dollars per share)	$ 0.83	$ (0.43)
Net income (loss) per share, diluted (in dollars per share)	$ 0.19	$ (0.43)