SEGMENT AND GEOGRAPHIC INFORMATION - GEOGRAPHIC AREAS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Geographic information
Long-lived assets	$ 6,400	$ 5,695
Total (excluding interest income)	18,105	18,329
United States
Geographic information
Long-lived assets	4,180	3,393
Total (excluding interest income)	7,700	11,325
Canada
Geographic information
Long-lived assets	2,220	2,302
Total (excluding interest income)	$ 10,405	$ 7,004